conf: fix enum convertor function for feature capability errors

A copy+paste mistaken meant the wrong enum -> string convertor
function was used for the error when an incorrect feature capability was
used.
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/conf/domain_conf.c

@@ -20528,7 +20528,7 @@ virDomainDefParseXML(xmlDocPtr xml,
             if ((def->caps_features[val] = virTristateSwitchTypeFromString(tmp)) == -1) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                _("unknown state attribute '%s' of feature capability '%s'"),
-                               tmp, virDomainFeatureTypeToString(val));
+                               tmp, virDomainCapsFeatureTypeToString(val));
                 goto error;
             }
             VIR_FREE(tmp);