Fix TextInput value not restoring after reuse

Summary:
Changelog: [Internal]

# Problem

The problem was setting `_backedTextInputView.attributedText` to nil inside `[RCTTextInputComponentView prepareForRecycle]`.

Ordinarily this isn't a problem becase `UIManager::updateState` drops the update if the ShadowNode no longer exists. But in certain cases the ShadowNode can exist, empty string being set as its value

# Fix

Fix is trivial, invalidate state before nullifying `_backedTextInputView`. This prevents the state update from being dispatched.

# Discussion

We should go over all other components and make sure state is invalidated as first thing in `[RCTViewComponentView prepareForRecycle]`.

Reviewed By: shergin

Differential Revision: D23324929

fbshipit-source-id: 9568e920d99683ad95f965ef4b63c529f50f3283

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

@@ -249,9 +249,9 @@ - (void)updateLayoutMetrics:(LayoutMetrics const &)layoutMetrics
 - (void)prepareForRecycle
 {
   [super prepareForRecycle];
+  _stateTeller.invalidate();
   _backedTextInputView.attributedText = nil;
   _mostRecentEventCount = 0;
-  _stateTeller.invalidate();
   _comingFromJS = NO;
   _lastStringStateWasUpdatedWith = nil;
   _ignoreNextTextInputCall = NO;