Disallow palette for bit_depth > 24
Disallow palette for bit_depth > 24

Follow-up on https://github.com/libjxl/libjxl/pull/1060#issuecomment-1012080914

libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl