aco: Align NGG scratch size to 16 so a single ds_read can always read it.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <!10155>
36 jobs for !10155 with aco-ngg-wgscan-opt in 9 minutes and 15 seconds (queued for 4 seconds)
latest detached
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  Sanity
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  Container
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  Container 2
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  Meson X86 64
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  Build Misc
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passed meson-arm64-build-test #8871526
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passed meson-i386 #8871528

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  Amd
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