Add global config option show_delete_on_forms

setting the show_delete_on_forms template var needs a better place ... somewhere in interface/web/admin/form/system_config.tform.php ?
But that also messed up the system config -> misc form ... name clash
1 job for !1362 with patch-del-button-on-edit-form in 8 minutes and 2 seconds (queued for 14 seconds)
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passed syntax:lint #9339