fdo#39477: Mac Keyboard shortcut Option key ko in Customize dialog

(+ fdo#49280)
I couldn't cherry-pick directly since the arbo is different between 4.2 and 4.3+
Indeed vcl/aqua is now vcl/osx

Change-Id: I45a834c5ec1e4c4c5c4fd6960b48963df5656a7e
Reviewed-on: https://gerrit.libreoffice.org/10898
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>