typescript-fetch: Remove superfluous closing parenthesis

Created by: Dynalon

[x] successfully ran bin/typescript-fetch-petstore-all.sh

There is an obvious syntax error in the template for the typescript-fetch language: The second closing parenthesis is superfluous and has no matching counterpart. This results in a syntax error when compiling with the typescript compiler and breaks the generated code.

You can use any editor that highlights matching parenthisis to see there is no counterpart in that line, block, or elsewhere.

Highlighting typescript-fetch technical comittee: @TiFu @taxpon @sebastianhaas @kenisteward @Vrolijkx @macjohnny @nicokoenig @topce

modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache

@@ -94,7 +94,7 @@ export class {{classname}} extends runtime.BaseAPI {
         {{#headerParams}}
         {{#isListContainer}}
         if (requestParameters.{{paramName}}) {
-            headerParameters['{{baseName}}'] = requestParameters.{{paramName}}.join(runtime.COLLECTION_FORMATS["{{collectionFormat}}"]));
+            headerParameters['{{baseName}}'] = requestParameters.{{paramName}}.join(runtime.COLLECTION_FORMATS["{{collectionFormat}}"]);
         }
 
         {{/isListContainer}}