Multiple small admin dashboard fixes (#12153) (#12156)

* 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/auth/admin.go

@@ -51,7 +51,8 @@ func (f *AdminEditUserForm) Validate(ctx *macaron.Context, errs binding.Errors)
 
 // AdminDashboardForm form for admin dashboard operations
 type AdminDashboardForm struct {
-	Op string `binding:"required"`
+	Op   string `binding:"required"`
+	From string
 }
 
 // Validate validates form fields