Remove unused no_windowing_ui code fontforge/parsettfbmf.c

Two consecutive else if() statements test the same condition.  The
second true clause is never executed (since 2007!).  Reviewing the
blame listing for chain of changes did not reveal intent behind the
code in the second unused clause.

Testing with and without scripting confirms the second clause is
never executed.

This change removes the second clause, for five unused lines of code.
Merge pull request #1667 from tshinnic/parsettfbmf_unused_2nd_clause

Remove unused no_windowing_ui code fontforge/parsettfbmf.c