This corrects the selector for the delete link in `wp.updates.deletePlugin()` so the text can be changed to 'Deleting…'. `wp.updates.deleteTheme()` already worked on wp-admin/themes.php but not on wp-admin/network/themes.php because the network screen is similar to the plugins list table, this is now fixed too.
The `credential-modal-cancel` handler has been updated to support canceled delete jobs.
Props swissspidy.
Props jorbin for review.
Fixes#37603.
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git-svn-id: http://core.svn.wordpress.org/trunk@38168 1a063a9b-81f0-0310-95a4-ce76da25c4cd