A recent set of changes replaced the "dfilter_erase_" images with an
"x-filter-clear" stock icon set.
Move StockIconToolButton to its own compilation unit. Use it in
CaptureFilterEdit and ProgressFrame to load the "x-filter-clear" icon.
Bug: 11516
Change-Id: I5d5864d089fb56827d130d493d53e7de6a7c03b5
Reviewed-on: https://code.wireshark.org/review/10475
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>