Cube: Add app-cube.png 16x16 icon

Author: https://github.com/bcoles
Commit: https://github.com/SerenityOS/serenity/commit/6c1e842a7ec
Pull-request: https://github.com/SerenityOS/serenity/pull/2055

Base/res/apps/Cube.af

@@ -2,3 +2,6 @@
 Name=Cube
 Executable=/bin/Cube
 Category=Demos
+
+[Icons]
+16x16=/res/icons/16x16/app-cube.png

Demos/Cube/Cube.cpp

@@ -207,7 +207,7 @@ int main(int argc, char** argv)
     cube.set_stat_label(time);
 
     window->show();
-    window->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/app-demo.png"));
+    window->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/app-cube.png"));
 
     return app.exec();
 }