Fix cursor not showing when tabbing into multiline TextInput (#1342)

This bug happens because `RCTUITextView` (which multiline TextInput uses) was overriding NSTextView's `becomeFirstResponder` method and didn't call `[super becomeFirstResponder]`.
This seems to mess with AppKit's logic of drawing the cursor initially.

This is alluded to in the [docs](https://developer.apple.com/documentation/appkit/nstextview/1807130-becomefirstresponder?language=objc#) for `[NSTextView becomeFirstResponder]`:

> If the previous first responder was not a text view on the same layout manager as the receiving text view, this method draws the selection and updates the insertion point if necessary.

Simply switching to call `[super becomeFirstResponder]` led to a cryptic exception within AppKit. This was likely because in the `reactFocus` (and `reactFocusIfNeeded`) we were calling `becomeFirstResponder` directly.
The [docs](https://developer.apple.com/documentation/appkit/nsresponder/1526750-becomefirstresponder?language=objc#) for `[NSResponder becomeFirstResponder]` say:

> Use the NSWindow makeFirstResponder: method, not this method, to make an object the first responder. Never invoke this method directly.

This fixed the issue

Co-authored-by: Liron Yahdav <lyahdav@fb.com>

Libraries/Text/TextInput/Multiline/RCTUITextView.m

@@ -172,7 +172,7 @@ - (NSAttributedString*)attributedText
 
 - (BOOL)becomeFirstResponder
 {
-  BOOL success =  [[self window] makeFirstResponder:self];
+  BOOL success = [super becomeFirstResponder];
 
   if (success) {
     id<RCTBackedTextInputDelegate> textInputDelegate = [self textInputDelegate];

React/Views/UIView+React.m

@@ -286,7 +286,7 @@ - (void)reactFocus
 	if (![[self window] makeFirstResponder:self]) {
 #else
 	if (![self becomeFirstResponder]) {
-#endif //// TODO(macOS GH#774)]
+#endif // TODO(macOS GH#774)]
 		self.reactIsFocusNeeded = YES;
 	}
 }