Clear Include In SROC supp. billing flag on send

https://eaflood.atlassian.net/browse/WATER-3948

We have an issue that the current `include_in_supplementary_billing` was added at a time there was only 1 charge scheme. A licence gets flagged irrespective of whether the change relates to PRESROC or SROC.

Where that has impacted us is when sending a billing batch. When it gets sent it clears the flag for _all_ licences included. But if we cancel one, for example, the PRESROC bill run, and send the SROC one we lose which licences still need to be processed on the PRESROC one.

Our solution was to add a new `include_in_sroc_supplementary_billing` flag to the `licences` table in [Add SROC include in supplementary billing flag](#2077). That also covered setting the new flag when a new charge version is approved. We now need to handle clearing the flag when the SROC bill run is 'sent'.