Revert "fix: Restore the default properties of dialog window so that the max and min buttons can be customized"

This reverts commit bf5155f8.

Maximize and minimize function hints provided by some applications are
bogus. This in its turn breaks video games that minimize themselves when
they loose input focus.

Ideally, the window manager should not be concerned about Motif hints
provided by NetWM applications as they set the window type.

BUG: 431450