Redraw the packet list when name resolution changes.

Redraw the packet list when name resolution changes.

Call columnsChanged (which invalidates cached column strings) when we
change our name resolution preferences from the View menu.

Remove the last sorted column tracking from gf19a173 while we're here
(it didn't work properly).

Bug: 11468
Change-Id: I7fea58d702b283028235d023f27ab0336d8643a4
Reviewed-on: https://code.wireshark.org/review/10301
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>