This changes the references to `wp.editor` in the text widget’s JavaScript to `wp.oldEditor`, which is the new location for the old `editor` script that was previously available at `window.wp.editor`.
Follow up to [51387-51388,51390].
Props spacedmonkey, zieladam.
Fixes#53437.
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git-svn-id: http://core.svn.wordpress.org/trunk@51020 1a063a9b-81f0-0310-95a4-ce76da25c4cd