cdl: Fix VK_EXT_layer_settings implementation #480

Job	Run time
code-format	9s
check_cdl	49s
windows (amd64_x86)	4m 54s
android (arm64-v8a)	4m 16s
windows (amd64)	4m 58s
android (armeabi-v7a)	3m 56s
linux (address sanitizer, debug)	3m 6s
linux (address sanitizer, release)	3m 52s
linux (none sanitizer, debug)	2m 29s
linux (thread sanitizer, release)	2m 50s
linux (none sanitizer, release)	2m 41s
Ubuntu Backcompat	1m 13s
linux (thread sanitizer, debug)	8m 2s
	43m 15s

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