fdo#86607 removal of the 'Custom Animation' entry from context menu

Change-Id: I34800f3672d3caaa37c751e59b68ed426bf70d50
Reviewed-on: https://gerrit.libreoffice.org/13525
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>