Fix/simplify setting of one Failed-AVP

When setting the Result-Code/Failed-AVP of an outgoing answer from an
errors list either returned from or not discarded by a handle_request
callback, more than the AVP paired with the Result-Code in question
could be set in Failed-AVP.

RFC 6733:

7.5.  Failed-AVP AVP

   The Failed-AVP AVP (AVP Code 279) is of type Grouped and provides
   debugging information in cases where a request is rejected or not
   fully processed due to erroneous information in a specific AVP.  The
   value of the Result-Code AVP will provide information on the reason
   for the Failed-AVP AVP.  A Diameter answer message SHOULD contain an
   instance of the Failed-AVP AVP that corresponds to the error
   indicated by the Result-Code AVP.  For practical purposes, this
   Failed-AVP would typically refer to the first AVP processing error
   that a Diameter node encounters.

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