fixes a bug where NavigationPropTypes.SceneRenderer was a plain object

Summary:
... used as both a shape and plain object.

this splits them out so both parts can be used as needed.

NavigationPropTypes.SceneRenderer is a PropTypes shape
NavigationPropTypes.SceneRendererProps is the plain object that makes up the shape.
Closes https://github.com/facebook/react-native/pull/7518

Differential Revision: D3317322

Pulled By: ericvicenti

fbshipit-source-id: e8a31e05130e6647b63f68dbef31bc874550948c

Libraries/CustomComponents/NavigationExperimental/NavigationCard.js

@@ -92,7 +92,7 @@ class NavigationCard extends React.Component<any, Props, any> {
   props: Props;
 
   static propTypes = {
-    ...NavigationPropTypes.SceneRenderer,
+    ...NavigationPropTypes.SceneRendererProps,
     onComponentRef: PropTypes.func.isRequired,
     panHandlers: NavigationPropTypes.panHandlers,
     pointerEvents: PropTypes.string.isRequired,

Libraries/CustomComponents/NavigationExperimental/NavigationCardStack.js

@@ -90,7 +90,7 @@ class NavigationCardStack extends React.Component<DefaultProps, Props, void> {
   static propTypes = {
     direction: PropTypes.oneOf([Directions.HORIZONTAL, Directions.VERTICAL]),
     navigationState: NavigationPropTypes.navigationParentState.isRequired,
-    onNavigate: NavigationPropTypes.SceneRenderer.onNavigate,
+    onNavigate: NavigationPropTypes.SceneRendererProps.onNavigate,
     renderOverlay: PropTypes.func,
     renderScene: PropTypes.func.isRequired,
   };

Libraries/CustomComponents/NavigationExperimental/NavigationHeader.js

@@ -103,7 +103,7 @@ class NavigationHeader extends React.Component<DefaultProps, Props, any> {
   };
 
   static propTypes = {
-    ...NavigationPropTypes.SceneRenderer,
+    ...NavigationPropTypes.SceneRendererProps,
     renderLeftComponent: PropTypes.func,
     renderRightComponent: PropTypes.func,
     renderTitleComponent: PropTypes.func,