Fixes the non-working query parameter when it's a Enum

Author: IvanVas

modules/openapi-generator/src/main/resources/typescript/api/api.mustache

@@ -78,9 +78,7 @@ export class {{classname}}RequestFactory extends BaseAPIRequestFactory {
             }
             {{/isArray}}
             {{^isArray}}
-            for (const key of Object.keys(serializedParams)) {
-                requestContext.setQueryParam(key, serializedParams[key]);
-            }
+	    requestContext.setQueryParam("{{baseName}}", serializedParams);
             {{/isArray}}
             {{/isExplode}}
             {{^isExplode}}