remove TODO item about allowing the editing of UTF-8 as raw bytes when

remove TODO item about allowing the editing of UTF-8 as raw bytes when
the NO_CONVERT flag is used, as it will be practically impossible to get
right (since displayed non-editable strings should always be parsed as
UTF-8, whether the edited text is or not, and the switching back and
forth between raw and normal mode when editing text and displaying it
will be far too complicated)

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2452 35c25a1d-7b9e-4130-9fde-d3aeb78583b8