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.

git-svn-id: https://develop.svn.wordpress.org/trunk@45564 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/edit-form-blocks.php

@@ -226,6 +226,8 @@
 // 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;