vaav1enc: Do not enable palette mode by default
Palette mode should only be enabled only when we know that the content of the picture is simple. For example, only white letters on black screen in SCC mode. So, by default, we need to disable it.
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Palette mode should only be enabled only when we know that the content of the picture is simple. For example, only white letters on black screen in SCC mode. So, by default, we need to disable it.