Fix HeaderAcceptField comp

[maxtropets]

Found with bound checking enabled on Azure Linux (#6720)

27: /usr/bin/../include/c++/v1/__debug_utils/strict_weak_ordering_check.h:50: assertion !__comp(*(__first + __a), *(__first + __b)) failed: Your comparator is not a valid strict-weak ordering

For instance, for a = "*/subtype/1.0" and b = "*/another/1.0" we get a < b == b < a == true, which doesn't satisfy the operator<() requirement.

Same applied for subtype comparison.

Changed the comparator function to only compare as less for a wildcard type pair if only one of the two types is a wildcard.