Fix the build for displaying the tabs wrongly on mac
Change-Id: I58265b7cf9a4758885ef1add13417c42a467be9d
Reviewed-on: https://code.wireshark.org/review/30462
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Roland Knall <rknall@gmail.com>