rtftok: stop sending sprm:CRgFtc{0,1,2} tokens

Change-Id: I5009fb6214da763750fba3aa7067e1e28441d7dd
writerfilter: remove handling of never-generated sprm:CRgFtc{0,1,2} tokens

Change-Id: Idbdd4d9b8e0498f09c9a66391a8e8d0bd31606ea