Converted mouse pointer from grayscale to RGB

(cherry picked from commit e98508d6)

Change-Id: I990b1be02b2f9cf47a7587982f7a28159ad2f139
Reviewed-on: https://gerrit.libreoffice.org/67592
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>