This Fixes scroll to top and resigning first responder

Reviewed By: tadeuzagallo

Differential Revision: D2713488

fb-gh-sync-id: 99b2646f7bf8a3ee889bbb856c298beed6817321

Libraries/Text/RCTTextView.m

@@ -81,6 +81,7 @@
     _textView.delegate = self;
 
     _scrollView = [[UIScrollView alloc] initWithFrame:CGRectZero];
+    _scrollView.scrollsToTop = NO;
     [_scrollView addSubview:_textView];
 
     _previousSelectionRange = _textView.selectedTextRange;