Resolves: fdo#35779 set the bg color of the editeng from the text shape

Change-Id: I75feaea2dbd6c703cb3093c119a69985ecd89419
(cherry picked from commit 76a0b3170664b19c3eb66edc8fccb04dc5485387)
Reviewed-on: https://gerrit.libreoffice.org/7380
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>