Use hook on init to properly set global vars

At this point `wp.data.dispatch('core/editor')` is available React is not rendered yet so we can properly override the savePost function.

ui/js/dfv/src/core/app.js

@@ -14,13 +14,17 @@ import ConnectedFieldWrapper from 'dfv/src/components/connected-field-wrapper';
  * Pods config
  */
 import { FIELD_PROP_TYPE_SHAPE } from 'dfv/src/config/prop-types';
+import useBlockEditor from '../hooks/useBlockEditor';
 
 const App = ( {
 	storeKey,
 } ) => {
 	const fieldsData = PodsDFVAPI._fieldDataByStoreKeyPrefix[ storeKey ];
 	const allPodFieldsMap = new Map( fieldsData.map( ( field ) => [ field.name, field ] ) );
 
+	// Initialize Pods Block Editor overrides if available.
+	useBlockEditor();
+
 	const fieldComponents = fieldsData.map( ( fieldData = {} ) => {
 		const {
 			directRender = false,