Revert r3215. The original issue it "fixed" is no longer
reproduciable, and the change causes the wrong symbol to be
generated for Ctrl-minus. STR 264.


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10303 ea41ed52-d2ee-0310-a9c1-e6b18d33e121