Administration: Add `delete_count` to `wp_removable_query_args()`.

It's a single-use URL parameter that does not need to be passed to canonical URLs in the admin.

Props opurockey.
Fixes #50464.
Built from https://develop.svn.wordpress.org/trunk@48319


git-svn-id: http://core.svn.wordpress.org/trunk@48088 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -1183,6 +1183,7 @@ function wp_removable_query_args() {
 		'activated',
 		'approved',
 		'deactivate',
+		'delete_count',
 		'deleted',
 		'disabled',
 		'doing_wp_cron',

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-48318';
+$wp_version = '5.5-alpha-48319';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.