Add alternate overlay for platforms that to not require touch input controls.

Author: mupfdev

CMakeLists.txt

@@ -167,7 +167,7 @@ elseif(VITA)
 
 elseif(EMSCRIPTEN)
   target_link_options(open8 PRIVATE
-    "SHELL:--preload-file ${EXPORT_DIR}/overlay.png@overlay.png"
+    "SHELL:--preload-file ${EXPORT_DIR}/overlay-touch.png@overlay.png"
     "SHELL:--preload-file ${EXPORT_DIR}/carts/0PTENNIS.PNG@carts/0PTENNIS.PNG"
     "SHELL:--preload-file ${EXPORT_DIR}/carts/1CELESTE.PNG@carts/1CELESTE.PNG"
     "SHELL:--preload-file ${EXPORT_DIR}/carts/2API.PNG@carts/2API.PNG"