Multiple small admin dashboard fixes (#12153)

* Remove spurious spacing between Maintenance Operations and its table on dashboard
* Prevent (EXTRA string) comments in Task headers
* Redirect tasks started from monitor page back to monitor
* Fix #12107 - redirects from process cancel should use AppSubUrl
* When wrapping queues set the name correctly

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/queue/setting.go

@@ -75,6 +75,7 @@ func CreateQueue(name string, handle HandlerFunc, exemplar interface{}) Queue {
 			MaxAttempts: q.MaxAttempts,
 			Config:      cfg,
 			QueueLength: q.Length,
+			Name:        name,
 		}, exemplar)
 	}
 	if err != nil {