[win] Don't process WT_CSRCHANGE messages (and don't remove the packet)
[win] Don't process WT_CSRCHANGE messages (and don't remove the packet)

Some examples from Wacom don't remove the packet in WT_CSRCHANGE, but
they just peek it. Maybe this is what it's making us losing pressure
information/packets in some tablets.

aseprite/laf,aseprite/laf