webadmin: update search string on bookmark selection

After editing a bookmark name, that bookmark wasn't being properly cleared
of its selection. The UI component was no longer selected, but the model
thought it was still selected. So re-clicking that bookmark had no effect.

Fixed by properly clearing the bookmark selection on bookmark save.

Change-Id: Ic9763ab32eb3fcef7375553e7b9e264899583a1d
Bug-Url: https://bugzilla.redhat.com/996611
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>