userportal: extended event sub tab loading

- Fixed issue where the event list was not showing
  the loading indicator when loading data.

Change-Id: I81495d93c0fb9a7989ff2147d6bfcbd8d769d6ff
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1079937
Signed-off-by: Alexander Wels <awels@redhat.com>