Use proper ordering for sending txs in p2p_compactblocks

Summary: One test is missing this (while others already use topological ordering). This could cause some txs to not be added to the mempool without an extra round of messaging after the loop logic change in the orphanage processing from core#26295.

Test Plan:

./test/functional/test_runner.py p2p_compactblocks

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D16238