Do not animate layout if keyboard state is not changed

Andr3wHur5t#66
I've found that closing a modal cause keyboard to open and then immediately hide, which causes multiple calls of resetKeyboardSpace function, and this causes an error:
Warning: Overriding previous layout animation

Which affects Modal somehow, because it could not be hidden after this warning.

KeyboardSpacer.js

@@ -86,7 +86,7 @@ export default class KeyboardSpacer extends Component {
   }
 
   updateKeyboardSpace(event) {
-    if (!event.endCoordinates) {
+    if (!event.endCoordinates || this.state.isKeyboardOpened) {
       return;
     }
 
@@ -113,6 +113,10 @@ export default class KeyboardSpacer extends Component {
   }
 
   resetKeyboardSpace(event) {
+    if (!this.state.isKeyboardOpened) {
+      return;
+    }
+
     let animationConfig = defaultAnimation;
     if (Platform.OS === 'ios') {
       animationConfig = LayoutAnimation.create(