Qt: Redraw the packet list when a column is resized.

...otherwise the packet list and header columns don't match until
the next redraw.

Change-Id: Ice9c17c93badec93839be7c100ca27d8dc493daa
Reviewed-on: https://code.wireshark.org/review/7536
Reviewed-by: Gerald Combs <gerald@wireshark.org>

ui/qt/packet_list.cpp

@@ -1159,6 +1159,7 @@ void PacketList::sectionResized(int, int, int)
     // our doing. Either way this catches that and fixes it.
     if (isVisible()) {
         column_state_ = header()->saveState();
+        redrawVisiblePackets();
     }
 }