tdf#135794 sw: add no-frames to AllowCommentsInFootnotes
DOCX also doesn't allow comments in textboxs / frames,
so add that situation to the existing option that
was attempting to improve DOCX compatibility.
By default, comments are allowed in frames.
Although the option name is worded fairly specifically,
I don't see any reason for adding a second option.
I also didn't want to change the name to be more generic
since this has been in existance since 6.4.
Change-Id: I3cc8631b4379a0523f2556ff99aed9127016485c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137010
Tested-by: Jenkins
Reviewed-by: Gabor Kelemen <kelemeng@ubuntu.com>