[avalanche] Make sure we remember the avalanche addresses we sent

Summary: If the node is getting requested for avalanche addresses before any address or address request has been the sent address won't be added to the m_addr_known filter.

Test Plan:

ninja
ninja check
./test/functional/test_runner.py abc_p2p_getavaaddr

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11990