wintab driver on/off makes touch events disappear

[keszegh]

when i turn on/off the wintabdriver using the pen (clicking on a checkbox in imgui triggers application:set("wintabMode",1) and application:set("wintabMode",0)) then if in wacom settings 'windows ink' is off then after a few on/off switches the touch input completely goes away for some reason. app still runs, responds to keys, but does not respond to mouse/pen, it seems that these events do not happen after this point. note that if i lclick with mouse then there is no such issue, so it seems somehow the problem is maybe related to pen state at the time of switching.