Widgets: Insert widgets into the selected sidebar correctly in accessibility mode.

Renames variables to resolve conflict with outer scope variables, fixing widget placement in selected sidebars.

Props joedolson, sabernhardt, vybiral, wildworks.
Fixes #64380.

git-svn-id: https://develop.svn.wordpress.org/trunk@61399 602fd350-edb4-49c9-b593-d223f7449a82

Author: t-hamano

src/wp-admin/widgets-form.php

@@ -187,9 +187,9 @@
 
 	// Remove old position.
 	if ( ! isset( $_POST['delete_widget'] ) ) {
-		foreach ( $sidebars_widgets as $sidebar_id => $sidebar ) {
-			if ( is_array( $sidebar ) ) {
-				$sidebars_widgets[ $sidebar_id ] = array_diff( $sidebar, array( $widget_id ) );
+		foreach ( $sidebars_widgets as $sidebar_widget_id => $sidebar_widget ) {
+			if ( is_array( $sidebar_widget ) ) {
+				$sidebars_widgets[ $sidebar_widget_id ] = array_diff( $sidebar_widget, array( $widget_id ) );
 			}
 		}