Administration: Match title tag to menu item for Editor.

Removes 'beta' from the title element for the site editor. Follow up to [55281].

Props kebbet.
Fixes #57654.
Built from https://develop.svn.wordpress.org/trunk@55288


git-svn-id: http://core.svn.wordpress.org/trunk@54821 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/site-editor.php

@@ -46,7 +46,7 @@ if ( $home_template && empty( $_GET['postType'] ) && empty( $_GET['postId'] ) )
 }
 
 // Used in the HTML title tag.
-$title       = __( 'Editor (beta)' );
+$title       = _x( 'Editor', 'site editor title tag' );
 $parent_file = 'themes.php';
 
 // Flag that we're loading the block editor.