Fix assignment of hitTestEdgeInsets in RCTViewComponentView

Summary:
Changelog: [Internal]

If you look at implementation of hit testing in `RCTViewComponentView`

```
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
  if (UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero)) {
    return [super pointInside:point withEvent:event];
  }
  CGRect hitFrame = UIEdgeInsetsInsetRect(self.bounds, self.hitTestEdgeInsets);
  return CGRectContainsPoint(hitFrame, point);
}
```

you will notice that we use `UIEdgeInsetsInsetRect` to calculate hitFrame. The input for this function is bounds and `hitTestEdgeInsets`. `hitTestEdgeInsets` is our hitSlop.
Look at documentation of `UIEdgeInsetsInsetRect`, it says "Adjusts a rectangle by the given edge insets.".

So if you give it a positive edge insets, it will make the rect smaller.

That's why we need to reverse values of hitSlop to negative before assigning it to `hitTestEdgeInsets`.
Paper does the same thing here https://github.com/facebook/react-native/blob/d0871d0a9a373e1d3ac35da46c85c0d0e793116d/React/Views/RCTViewManager.m#L304-L305

Reviewed By: mdvacca

Differential Revision: D21661894

fbshipit-source-id: c3dd6c55b68e4fdef8589ca8f0484e2837b4136c

React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -180,7 +180,10 @@ using namespace facebook::react;
 
   // `hitSlop`
   if (oldViewProps.hitSlop != newViewProps.hitSlop) {
-    self.hitTestEdgeInsets = RCTUIEdgeInsetsFromEdgeInsets(newViewProps.hitSlop);
+    self.hitTestEdgeInsets = {-newViewProps.hitSlop.top,
+                              -newViewProps.hitSlop.left,
+                              -newViewProps.hitSlop.bottom,
+                              -newViewProps.hitSlop.right};
   }
 
   // `overflow`