Fix generated Go Opts struct name

Author: kostyay-lms

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

@@ -1,3 +1,4 @@
+
 {{>partial_header}}
 package {{packageName}}
 
@@ -25,19 +26,19 @@ type {{classname}}Service service
 {{notes}}{{/notes}}
  * @param ctx context.Context - for authentication, logging, cancellation, deadlines, tracing, etc. Passed from http.Request or context.Background().
 {{#allParams}}{{#required}} * @param {{paramName}}{{#description}} {{.}}{{/description}}
-{{/required}}{{/allParams}}{{#hasOptionalParams}} * @param optional nil or *{{{nickname}}}Opts - Optional Parameters:
+{{/required}}{{/allParams}}{{#hasOptionalParams}} * @param optional nil or *{{{classname}}}{{{nickname}}}Opts - Optional Parameters:
 {{#allParams}}{{^required}}     * @param "{{vendorExtensions.x-exportParamName}}" ({{#isPrimitiveType}}optional.{{vendorExtensions.x-optionalDataType}}{{/isPrimitiveType}}{{^isPrimitiveType}}optional.Interface of {{dataType}}{{/isPrimitiveType}}) - {{#description}} {{.}}{{/description}}
 {{/required}}{{/allParams}}{{/hasOptionalParams}}
 {{#returnType}}@return {{{returnType}}}{{/returnType}}
 */
 {{#hasOptionalParams}}
 
-type {{{nickname}}}Opts struct { {{#allParams}}{{^required}}
+type {{{classname}}}{{{nickname}}}Opts struct { {{#allParams}}{{^required}}
 {{#isPrimitiveType}}	{{vendorExtensions.x-exportParamName}} optional.{{vendorExtensions.x-optionalDataType}}{{/isPrimitiveType}}{{^isPrimitiveType}}	{{vendorExtensions.x-exportParamName}} optional.Interface{{/isPrimitiveType}}{{/required}}{{/allParams}}
 }
 
 {{/hasOptionalParams}}
-func (a *{{{classname}}}Service) {{{nickname}}}(ctx context.Context{{#hasParams}}, {{/hasParams}}{{#allParams}}{{#required}}{{paramName}} {{{dataType}}}{{#hasMore}}, {{/hasMore}}{{/required}}{{/allParams}}{{#hasOptionalParams}}localVarOptionals *{{{nickname}}}Opts{{/hasOptionalParams}}) ({{#returnType}}{{{returnType}}}, {{/returnType}}*http.Response, error) {
+func (a *{{{classname}}}Service) {{{nickname}}}(ctx context.Context{{#hasParams}}, {{/hasParams}}{{#allParams}}{{#required}}{{paramName}} {{{dataType}}}{{#hasMore}}, {{/hasMore}}{{/required}}{{/allParams}}{{#hasOptionalParams}}localVarOptionals *{{{classname}}}{{{nickname}}}Opts{{/hasOptionalParams}}) ({{#returnType}}{{{returnType}}}, {{/returnType}}*http.Response, error) {
 	var (
 		localVarHttpMethod = strings.ToUpper("{{httpMethod}}")
 		localVarPostBody   interface{}