xmonad: use AltGr for mouse bindings
xmonad: use AltGr for mouse bindings

This is because we use a left-handed mouse (that is, it is physically to
the left of the keyboard); before, the Hyper key (hypr) was underneath
the left thumb of the keyboard (ZQ layout), which made it awkward to use
the mouse bindings.

The fact that it's taken us this long to make this adjustment (we've
been using the ZQ layout for over a year now) shows just how
infrequently we use these bindings, which only really come in handy when
there are a lot of floating windows, such as for GIMP.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg