Reset touch state before calling onTouchEnd()

In case something calls MainWindow::run() during the execution of this handler. Otherwise it will generate a second touch-end event, on whatever is on the screen at this moment.

radio/src/thirdparty/libopenui/src/mainwindow.cpp

@@ -51,8 +51,8 @@ void MainWindow::checkEvents()
     slidingWindow = nullptr;
   }
   else if (touchState.event == TE_UP) {
-    onTouchEnd(touchState.startX + scrollPositionX, touchState.startY + scrollPositionY);
     touchState.event = TE_NONE;
+    onTouchEnd(touchState.startX + scrollPositionX, touchState.startY + scrollPositionY);
   }
   else if (touchState.event == TE_SLIDE) {
     if (touchState.deltaX || touchState.deltaY) {