dissect: don't honour NOAUTO flags when looking for ESP (#5224)

dissect: don't honour NOAUTO flags when looking for ESP (#5224)

The flag is originally defined for "basic data partitions", but not for the
ESP. We reuse it for the various partitions defined by the Discoverable
Partitions Spec, but it isn't defined for the ESP, hence don't check for
it. Instead, do check for GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as that flag
actually is defined for all partition types, and recommended to use by
the UEFI spec.

Fixes: #5218