SmShowSymbol handles font/fg/bg settings by itself, so make
ApplySettings noop there.

This partially reverts commit b010e407

Change-Id: Ib5074684ef1277d9b9b4646bd73dce4cbff3943e
Reviewed-on: https://gerrit.libreoffice.org/17288Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>