maximized: fix y position of eg. firefox wayland

Some windows apparently report the wrong frame.y value when they've just
been maximized, leaving us with the old incorrect value. Simply hardcode
the correct y value instead.

schemas: fix typo (paperwm#236)

minimum workspaces: Fix when using 3+ monitors

The monkey patched code in kludges wouldn't run on enable after eg.
unlocking as kludges.enable() happens after tiling.enable(). This left
us with too few workspaces.

readme: link to some common issues

liveAltTab: Include non-modal transient windows