Widgets: add a default filter for `widget_text` (used by the Text widget), `balanceTags`, which respects the option for `use_balanceTags`.

Props MikeHansenMe.
Fixes #23083.


git-svn-id: https://develop.svn.wordpress.org/trunk@35103 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/default-filters.php

@@ -157,6 +157,8 @@ add_filter( 'list_cats',         'wptexturize' );
 
 add_filter( 'wp_sprintf', 'wp_sprintf_l', 10, 2 );
 
+add_filter( 'widget_text', 'balanceTags' );
+
 // RSS filters
 add_filter( 'the_title_rss',      'strip_tags'                    );
 add_filter( 'the_title_rss',      'ent2ncr',                    8 );