[sr-dev] [kamailio/kamailio] lost: lost_held_dereference do not handles error message (#2724)

[sergey-safarov]

### Description

When LIS server failed, then LIS send message like
```
   The error response to the request is an error document.  The
   following response shows an example error response.

         HTTP/1.1 200 OK
         Server: Example LIS
         Expires: Tue, 10 Jan 2006 03:49:20 GMT
         Cache-control: private
         Content-Type: application/held+xml;charset=utf-8
         Content-Length: 182

         <?xml version="1.0"?>
         <error xmlns="urn:ietf:params:xml:ns:geopriv:held"
            code="locationUnknown">
           <message xml:lang="en">Unable to determine location
           </message>
         </error>
```
Here is HTTP code is 200.
lost_held_dereference now simply check HTTP code and do not check XML body.

Expected XML content check for:
1. XML HELD error message
2. check `findServiceResponse` or `presence` element check like it done for `lost_query`.

This check is important because PIDF-LO object may be added to the multipart body. And HELD XML error handling prevents error message addition as PDF-LO object.


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https://github.com/kamailio/kamailio/issues/2724
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