Remove attempt to set sort_name & display_name.

On testing I found that what we were setting was being ignored (otherwise the cleanups
would not have flowed through).

I have done an upstream PR to address length handling in core
civicrm/civicrm-core#11063

I don't think it's pressing for us to address long_name handling (ie.
we can suck that PR in now or wait for the next update) but
removing these 2 lines gets rid of the misleading impression that they
have an effect

Change-Id: I0be0a8883e19378019adf29f9b4cb76add4e812e

sites/all/modules/wmf_civicrm/wmf_civicrm.module

@@ -1079,9 +1079,6 @@ function wmf_civicrm_message_contact_insert( $msg, $contact_id=NULL ) {
           $contact[$name] = substr(trim($msg[$name]), 0, 64);
         }
       }
-      // @todo this may not be needed as core may handle, but unsure how it handles over-long strings.
-      $contact['sort_name'] = substr(trim($msg['last_name'] . ', ' . $msg['first_name'], ' ,'), 0, 128);
-      $contact['display_name'] = substr($msg['first_name'] . ' ' . $msg['last_name'], 0, 128 );
     }
     if ( strtolower( $msg['contact_type'] ) == "organization" ){
         // @todo probably can remove handling for sort name and display name now.