Enable tooltips by default, and don't enable them when setting the
tooltip value, since that will negate any changes a program might
make when displaying the file chooser dialog, etc.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@1777 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
