put back in cropped curly bracket

Author: Peter Saffrey

modules/swagger-codegen/src/main/resources/go/api.mustache

@@ -149,7 +149,7 @@ func (a *{{{classname}}}Service) {{{nickname}}}(ctx context.Context{{#hasParams}
 {{#formParams}}
 {{#isFile}}
 	var localVarFile {{dataType}}
-{^required}}
+{{^required}}
 	if localVarOptionals != nil && localVarOptionals.{{vendorExtensions.x-exportParamName}}.IsSet() {
 		localVarFileOk := false
 		localVarFile, localVarFileOk = localVarOptionals.{{vendorExtensions.x-exportParamName}}.Value().({{dataType}})