[sr-dev] [kamailio/kamailio] topos: remove contact header for CANCEL, BYE, PRACK REQUESTS (PR #3149)

[Henning Westerholt]

@miconda I think this is the relevant table in section 20 [link](https://datatracker.ietf.org/doc/html/rfc3261#section-20)

Seems to be pretty clear, if I read it correctly.

```
      -: The header field is not applicable.

   "Not applicable" means that the header
   field MUST NOT be present in a request.  If one is placed in a
   request by mistake, it MUST be ignored by the UAS receiving the
   request.  Similarly, a header field labeled "not applicable" for a
   response means that the UAS MUST NOT place the header field in the
   response, and the UAC MUST ignore the header field in the response.
```

```
      Header field          where   proxy ACK BYE CAN INV OPT REG
      ___________________________________________________________
      Contact                 R            o   -   -   m   o   o
      Contact                1xx           -   -   -   o   -   -
      Contact                2xx           -   -   -   m   o   o
      Contact                3xx      d    -   o   -   o   o   o
      Contact                485           -   o   -   o   o   o
```

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