fix typo in color name

Change-Id: I0bd01210cea6336a09ada718fe2b3c06b07942ce
Reviewed-on: https://gerrit.libreoffice.org/13071
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>