This opacity influences the whole shape (stroke and fill).

Reviewed-on: https://gerrit.libreoffice.org/70292
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
(cherry picked from commit fcb00ac8)

Change-Id: I82e10e07dbf2f321805b55a5f4831a513e52dab8