floating: mark windows as mapped after configuring them
floating: mark windows as mapped after configuring them

We have some internal self.hidden checks in window.py:focus() which we
should probably just get rid of entirely. But until now, let's mark windows
as mapped if they're going through the floating process. They've either
mapped themselves, or this will map them at the end of the function.

Signed-off-by: Tycho Andersen <6b523322678240882acbb4da5312a12d8cd0082d@tycho.ws>

ramnes/qtile,qtile/qtile,qtile/qtile,ramnes/qtile