Resign text input as first responder in prepareForRecycle

Summary:
Changelog: [internal]

To prevent wrong TextInput becoming first responder, force a resign when preparing for a reuse.

Reviewed By: JoshuaGross

Differential Revision: D29085923

fbshipit-source-id: 246cdf0628f914c3928cc9c7499d029b77684f2c

React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -258,6 +258,7 @@ using namespace facebook::react;
   _lastStringStateWasUpdatedWith = nil;
   _ignoreNextTextInputCall = NO;
   _didMoveToWindow = NO;
+  [_backedTextInputView resignFirstResponder];
 }
 
 #pragma mark - RCTBackedTextInputDelegate