Should allow release creation with user provided revision even if there is gap from the last MAX revision for that semver

[thgreasi]

Should change the check to be user_provided_revision >= Max(db_revision + 1) rather than just = like it was before.

See: https://balena.zulipchat.com/#narrow/stream/345890-balena-io/topic/balena.2Eio.20product.20brainstorm/near/340642232