keyboardDidHide wrong screenY coordinates with windowTranslucentStatus=true (#29292)

Summary:
This issue fixes https://github.com/facebook/react-native/issues/27526, related issue https://github.com/facebook/react-native/issues/27089
Avoid returning the wrong screenY coordinates on event keyboardDidHide.
getWindowVisibleDisplayFrame retrieves the overall visible display size in which the window this view is attached to has been positioned in. This takes into account screen decorations above the window, for both cases where the window itself is being position inside of them or the window is being placed under then and covered insets are used for the window to position its content inside. In effect, this tells you the available area where content can be placed and remain visible to users, since anything below the StatusBar is not visible to the user, the method does not work with translucent StatusBar (android:windowTranslucentStatus).

This commit fixes this issues removing the white bar at the bottom of the view when using windowTranslucentStatus.

## Changelog

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[Android] [Fixed] - keyboardDidHide wrong screenY coordinates with windowTranslucentStatus=true

Pull Request resolved: https://github.com/facebook/react-native/pull/29292

Test Plan:
Works in all scenarios, but **I did not change RNTester `windowTranslucentStatus`**. I would like to discuss the potential breaking changes connected to not using [getWindowVisibleDisplayFrame](https://developer.android.com/reference/android/view/View#getWindowVisibleDisplayFrame(android.graphics.Rect)) with `keyboardDidHide`.

I would be happy to build an alternative functionality to calculate the WindowVisibleDisplayFrameHeight under request from the Facebook Team.

**WITHOUT** `android:windowTranslucentStatus`

| **BEFORE** |
|:-------------------------:|
|  <img src="https://user-images.githubusercontent.com/24992535/86804255-0eca4680-c077-11ea-8c79-95ba297d05ba.gif"  />|

| **AFTER** |
|:-------------------------:|
| <img src="https://user-images.githubusercontent.com/24992535/86804265-10940a00-c077-11ea-8cb8-a304cc5de363.gif"  /> |

**WITH** `android:windowTranslucentStatus`

| **BEFORE** |
|:-------------------------:|
|  <img src="https://user-images.githubusercontent.com/24992535/86804458-3a4d3100-c077-11ea-8f3e-7c43eaa08d70.gif"  height="" />|

| **BEFORE (log)** |
|:-------------------------:|
|  <img src="https://user-images.githubusercontent.com/24992535/86806330-0d018280-c079-11ea-9266-c3bcf23a35da.png"  height="" />|

| **AFTER** |
|:-------------------------:|
| <img src="https://user-images.githubusercontent.com/24992535/86804464-3b7e5e00-c077-11ea-8487-34c87f076e5f.gif" height="" /> |

| **AFTER (log)** |
|:-------------------------:|
| <img src="https://user-images.githubusercontent.com/24992535/86806042-c4e26000-c078-11ea-9c3c-cac5319bef65.png" height="" /> |

RNTester **WITHOUT** `android:windowTranslucentStatus`

| **BEFORE** | **AFTER** |
|:-------------------------:|:-------------------------:|
|  <img src="https://user-images.githubusercontent.com/24992535/86805348-176f4c80-c078-11ea-8e2a-e2d84af5c278.gif"  width="300" height="" />| <img src="https://user-images.githubusercontent.com/24992535/86805324-13432f00-c078-11ea-9e70-fa2606eee86b.gif" width="300" height="" /> |

I remain available to do improvements. Thanks a lot. Fabrizio.

Reviewed By: JoshuaGross

Differential Revision: D22521125

Pulled By: mdvacca

fbshipit-source-id: e2cb90163abb1baa00b1916e431971b011522565

ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -684,7 +684,7 @@ public class ReactRootView extends FrameLayout implements RootView, ReactRoot {
         sendEvent(
             "keyboardDidHide",
             createKeyboardEventPayload(
-                PixelUtil.toDIPFromPixel(mVisibleViewArea.height()),
+                PixelUtil.toDIPFromPixel(mLastHeight),
                 0,
                 PixelUtil.toDIPFromPixel(mVisibleViewArea.width()),
                 0));