[DEMO Patch 3] Bugfixes

This minor patch brings few changes and performance improvements to the demo of Pipeworks Puzzle:

• Vulkan default shader changed from SM5 back to SM6

• The colors of the starting screen has been reverted back to yellow.

• The framerate limiter has been fixed

As always, if you have any feedback, bug encounters, or feature request, please let me know via Discord (link below) and I will be happy to hear about it :)