fdo#82041 restore heading 3 and 4 color to automatic

Change-Id: I81de0e67b388507a29e3cb70a05f08775a380bad
Reviewed-on: https://gerrit.libreoffice.org/13642
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>