Fix missing parenthesis (#7923)

Author: dvarnai

modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache

@@ -165,7 +165,7 @@ export const {{classname}}AxiosParamCreator = function (configuration?: Configur
                 })
             {{/isCollectionFormatMulti}}
             {{^isCollectionFormatMulti}}
-                localVarFormParams.{{#multipartFormData}}append{{/multipartFormData}}{{^multipartFormData}}set{{/multipartFormData}}({{paramName}}.join(COLLECTION_FORMATS.{{collectionFormat}});
+                localVarFormParams.{{#multipartFormData}}append{{/multipartFormData}}{{^multipartFormData}}set{{/multipartFormData}}({{paramName}}.join(COLLECTION_FORMATS.{{collectionFormat}}));
             {{/isCollectionFormatMulti}}
             }{{/isArray}}
             {{^isArray}}