fdo#84904 Don’t stretch icons horizontally

Seems you need this, see also 36f275cb0f19d11151abf85f3c191a2736bd73da

Change-Id: I06970401d73bf8f73170bb1fc6bf001eac9947cf
Reviewed-on: https://gerrit.libreoffice.org/13083
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>
Tested-by: Maxim Monastirsky <momonasmon@gmail.com>