Made lurker.onerror() release the mouse

lurker.lua

@@ -95,6 +95,10 @@ function lurker.onerror(e, nostacktrace)
   end
   love.update = lurker.update
   
+  -- Release mouse
+  local setgrab = love.mouse.setGrab or love.mouse.setGrabbed
+  setgrab(false)
+
   local stacktrace = nostacktrace and "" or
                      lume.trim((debug.traceback("", 2):gsub("\t", "")))
   local msg = lume.format("{1}\n\n{2}", {e, stacktrace})