Manage state for inverted mouse camera horizontal setting

src/app/App.tsx

@@ -2768,6 +2768,10 @@ export function App({ store, initialStatusMessage }: AppProps) {
     playerStartTargetButtonCyclesActiveTargetDraft,
     setPlayerStartTargetButtonCyclesActiveTargetDraft
   ] = useState(DEFAULT_PLAYER_START_TARGET_BUTTON_CYCLES_ACTIVE_TARGET_VALUE);
+  const [
+    playerStartInvertMouseCameraHorizontalDraft,
+    setPlayerStartInvertMouseCameraHorizontalDraft
+  ] = useState(DEFAULT_PLAYER_START_INVERT_MOUSE_CAMERA_HORIZONTAL_VALUE);
   const [
     playerStartMovementTemplateDraft,
     setPlayerStartMovementTemplateDraft