dzn: Changes to descriptor set dirty flag handling

dzn: Changes to descriptor set dirty flag handling

The scenario of:
* App binds multiple descriptor sets
* App binds a pipeline that uses a subset of them
* App binds a pipeline that uses more of them

was broken. We were only copying the descriptors for the accessible
subset before, but then clearing all dirty bits, so simply changing
the pipeline wouldn't result in more descriptors being copied.

When running not-bindless, the right thing to do is to copy *all*
descriptors if we're copying any. When running bindless, each parameter
is set separately, and more importantly, *can't* be set on the command
list if the root signature can't access them.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22371>