[sr-dev] [kamailio/kamailio] schema: allow null value for active_watchers user-agent column (#1431)

[lazedo]

@miconda here https://github.com/kamailio/kamailio/blob/master/src/modules/presence/subscribe.c#L183
UA is not sending user-agent header in subscribe and its not mandatory in [rfc3265 ](https://www.ietf.org/rfc/rfc3265.txt), the schema should follow the standard

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