Kapsch ETX S0021 s should have a character for each detector logic

[emiltin]

The ETX sends "-" in S0021, even though the config lists several detector logics. The s string should contain one character per detector logic.

    2025-01-30T22:49:46.232Z  52068  KTT+TC=101TC001      KTT+TC=101TC001      1263  Received invalid StatusResponse schema errors: /sS/0/s, pattern,  {"mType":"rSMsg","type":"StatusResponse","mId":"1263e11c-06c0-44fd-814e-45f8f9a70f0a","sTs":"2025-01-30T22:49:45.431Z","ntsOId":"","xNId":"","cId":"KTT+TC=101TC001","sS":[{"sCI":"S0021","n":"detectorlogics","q":"recent","s":"-"}]}

Note: The string "-" is currently rejected due to a schema error, but this is due to an omission in the schema. It's currently not allowing dashes in the regex pattern, but it should:
rsmp-nordic/rsmp_schema#127

[emiltin]

I think the same is the case for S0002, causing the test "Site::Traffic Light Controller Detector Logic forcing is set with M0008" fails:
https://github.com/rsmp-nordic/rsmp_validator/actions/runs/13062231280/job/36447666042#step:6:596