Disable lossy palette in cjxl if progressive encoding is requested.
Disable lossy palette in cjxl if progressive encoding is requested.

Fixes #1177

Drive-by: simplify --qprogressive_ac and --responsive flag handling.

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