Werk #10133: Fixed source attribute of user comments

The CMC always reported all comments as coming from an "external" source, even acknowledgements. Nagios considers the latter as "internal", so we do the same now for consistency.

There is no impact on Checkmk's GUI, it doesn't use the "source" column from the "comments" table. You can only observe the change directly via Livestatus if you use that column, which is highly unlikely.

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