Joystick messages coordinates are unsigned, treat them as such.

Apparently the joystick messages (x, y) coordinates are unsigned, so use
LOWORD/HIWORD to extract them from LPARAM.

See #748.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70278 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/window.cpp

@@ -3023,8 +3023,8 @@ wxWindowMSW::MSWHandleMessage(WXLRESULT *result,
         case MM_JOY1BUTTONUP:
         case MM_JOY2BUTTONUP:
             processed = HandleJoystickEvent(message,
-                                            GET_X_LPARAM(lParam),
-                                            GET_Y_LPARAM(lParam),
+                                            LOWORD(lParam),
+                                            HIWORD(lParam),
                                             wParam);
             break;
 #endif // __WXMICROWIN__