flipping is fixed.

Labelcolor not gets updated immediately but when statechanged function
triggers via executemethod things workwell.(like it triggers on changing
mode of notebookbar)

Change-Id: I755fb4ff434d7971112d2f0beb44ca09f4a7e0f1
Reviewed-on: https://gerrit.libreoffice.org/54301Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>
Tested-by: Szymon Kłos <szymon.klos@collabora.com>