This replaces the variant in Color with the stricter one of
BitmapColor. I couldn't find any reasoning for the lazy variant
used in Color.

Change-Id: I6dab3ab94a7f24ef5e80299d64267e3be8df888c
Reviewed-on: https://gerrit.libreoffice.org/72234
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>