Editor: Fix undefined `$locked` var in edit-form-blocks.php when the `show_post_locked_dialog` filter is used to disable displaying of the dialog.

Props aprea.
Fixes #47604.
Built from https://develop.svn.wordpress.org/trunk@45564


git-svn-id: http://core.svn.wordpress.org/trunk@45375 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/edit-form-blocks.php

@@ -226,6 +226,8 @@ foreach ( $image_size_names as $image_size_slug => $image_size_name ) {
 // Lock settings.
 $user_id = wp_check_post_lock( $post->ID );
 if ( $user_id ) {
+	$locked = false;
+
 	/** This filter is documented in wp-admin/includes/post.php */
 	if ( apply_filters( 'show_post_locked_dialog', true, $post, $user_id ) ) {
 		$locked = true;

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45563';
+$wp_version = '5.3-alpha-45564';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.