Keep the overline color in DevOutState so that it can be
used in text actions later.

Change-Id: Ia584de9b78e1adf6862c09fb50cbed1f16e2ad0b
Reviewed-on: https://gerrit.libreoffice.org/62829
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>