search-view: fix time label

We want to show "All day" when the event is all day, not
when it ~isn't~ all day.

https://bugzilla.gnome.org/show_bug.cgi?id=771677

src/gcal-search-view.c

@@ -342,7 +342,7 @@ make_row_for_event (GcalSearchView *view,
   g_free (text);
 
   /* show 'all day' instead of 00:00 */
-  if (gcal_event_get_all_day (event))
+  if (!gcal_event_get_all_day (event))
     {
       text = g_date_time_format (local_datetime, view->format_24h ? "%R" : "%r");
       time_label = gtk_label_new (text);