Middle-click on the big map will make it disappear

git-svn-id: http://svn.net-core.org/repos/t-engine4@4943 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/dialogs/ShowMap.lua

@@ -73,7 +73,7 @@ function _M:init()
 		elseif button == "right" then
 			game.level.map:moveViewSurround(dx, dy, 1000, 1000)
 		elseif event == "button" and button == "middle" then
-			game.key:triggerVirtual("SHOW_MAP")
+			self.key:triggerVirtual("SHOW_MAP")
 		end
 
 	end, nil, nil, true)