change custom-keyboard useSafeArea default value to false same as other UILib props (#1172)

Author: mendyEdri

demo/src/screens/nativeComponentScreens/keyboardInput/KeyboardInputViewScreen.js

@@ -38,7 +38,7 @@ export default class KeyboardInputViewScreen extends PureComponent {
       initialProps: undefined
     },
     receivedKeyboardData: undefined,
-    useSafeArea: true,
+    useSafeArea: false,
     keyboardOpenState: false
   };
 

lib/components/Keyboard/KeyboardInput/CustomKeyboardView.ios.js

@@ -17,7 +17,7 @@ export default class CustomKeyboardView extends CustomKeyboardViewBase {
   };
 
   static defaultProps = {
-    useSafeArea: true
+    useSafeArea: false
   };
 
   constructor(props) {

lib/components/Keyboard/KeyboardTracking/KeyboardTrackingView.ios.js

@@ -36,7 +36,6 @@ class KeyboardTrackingView extends PureComponent {
     useSafeArea: PropTypes.bool
   };
 
-  /** V6 should be change to default false */
   static defaultProps = {
     useSafeArea: true
   };