Add missing user_id field that is required by some queries (e.g. invites)

[sierpinskid]

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Description of the pull request

Add missing user_id field that is required by some queries (e.g. invites)
example:
POST /channels

{"offset":0,"limit":20,"filter_conditions":{"invite":"pending","members":{"$in":["temp-test-user-43285d2c-2d50-4e28-8f96-32cee3013ee5"]}}}

returns an error QueryChannels failed with error: "invite requires a valid user", but works fine if user_id is added