Fix init for InputEvent (#8015)

src/input/TouchScreenImpl1.cpp

@@ -47,7 +47,7 @@ bool TouchScreenImpl1::getTouch(int16_t &x, int16_t &y)
  */
 void TouchScreenImpl1::onEvent(const TouchEvent &event)
 {
-    InputEvent e;
+    InputEvent e = {};
     e.source = event.source;
     e.kbchar = 0;
     e.touchX = event.x;