addrman: Log too low compat value

Summary:

Also remove uint8_t{} casts from values that are already of the same type.

Backport of core#24312.

Depends on D12348.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D12349