Ensure declined engines don't have engine records in meta/global #1866
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AFAICT desktop doesn't delete these when an engine is declined, but it does expect other clients to do so.
Something can't be right there, but this is a fix that ensures meta/global doesn't have any engine records for declined engines, which seems to be what https://searchfox.org/mozilla-central/source/services/sync/modules/stages/enginesync.js#268 expects.
It also fixes a bad log statement, and avoids logging a struct that contains sensitive data.
CC @grigoryk