receive_presence_and_ask_caps: only match the IQ result, not random other IQs
receive_presence_and_ask_caps: only match the IQ result, not random other IQs

When running these tests on a live network, we can see queries from
other contacts, which this overly-broad expectation would match.

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut