[Vulkan] Blank screen when build-in full screen selected

[selimanac]

Describe the bug (REQUIRED)
I know build-in full screen is not very popular choice but it is there... When using Vulkan, if the game uses build-in(from game.project) full screen option then the screen is blank, nothing show up..
I couldn't test it more since it require hard reset.

To Reproduce (REQUIRED)
Steps to reproduce the behavior:

1. Set Vulkan extension
2. Set display.fullscreen = 1
3. Build

Defold version (REQUIRED):

• 1.2.180

Platforms (REQUIRED):

• Platforms: macOS
• OS: 10.15.7