... Increase \ decrease font button

Change-Id: I52cf853de01b06c6c9db9779f15174f895789da8
Reviewed-on: https://gerrit.libreoffice.org/43962Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>