nemo-seahorse: Fix build with gpgme >= 2.0.0 (#553)

Author: andreasstieger

nemo-seahorse/tool/seahorse-pgp-operation.c

@@ -300,7 +300,6 @@ event_cb (void *data, gpgme_event_io_t type, void *type_data)
         break;
 
     case GPGME_EVENT_NEXT_KEY:
-    case GPGME_EVENT_NEXT_TRUSTITEM:
     default:
         /* Ignore unsupported event types */
         break;