vk/formats: Fix table entry for R8G8B8_SNORM
vk/formats: Fix table entry for R8G8B8_SNORM

Now that anv_formats[] is formatted like a table, buggy entries are
easier to see.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler