Change StatusBar default style handling strategy

Summary:
Changelog: [Android] - Change StatusBar style handling strategy

Previously Android status bar can set to `dark-content` or `default`, I made the following changes:

- Added `light-content` to get align with iOS
- Changed the behavior of `default` from setting status bar with 'SYSTEM_UI_FLAG_LIGHT_STATUS_BAR' to not doing anything, I did this because 1, `setStyle('default')` is found called even without explicitly declared <StatusBar> on that surface, which I think should fail silently 2, my idea is that user should set status bar style to `dark-content` or `light-content` explicitly instead of using `default`.
- Fixed the bug found in Dating Settings's Second Look.

Reviewed By: RSNara

Differential Revision: D24714152

fbshipit-source-id: 76e7d0d45fd3b8c3733efaee81426f5f449cc7d8

ReactAndroid/src/main/java/com/facebook/react/modules/statusbar/StatusBarModule.java

@@ -194,7 +194,7 @@ public class StatusBarModule extends NativeStatusBarManagerAndroidSpec {
               int systemUiVisibilityFlags = decorView.getSystemUiVisibility();
               if ("dark-content".equals(style)) {
                 systemUiVisibilityFlags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
-              } else {
+              } else if ("light-content".equals(style)) {
                 systemUiVisibilityFlags &= ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
               }
               decorView.setSystemUiVisibility(systemUiVisibilityFlags);