Reverted to Vulkan backend for macOS (contributed by williamchange)

Use Vulkan backend for macOS

Author: RodZill4

project.godot

@@ -151,6 +151,7 @@ limits/debugger/max_chars_per_second=204800000
 
 [rendering]
 
+rendering_device/driver.macos="vulkan"
 textures/vram_compression/import_etc2_astc=true
 shading/overrides/force_lambert_over_burley.mobile=false
 environment/defaults/default_environment="res://default_env.tres"