Merge pull request #8760 from swagger-api/fix_template_engine_overide

call the template engine retrieve method after codegen process option.

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/DefaultGenerator.java

@@ -89,9 +89,6 @@ public Generator opts(ClientOptInput opts) {
         if(this.ignoreProcessor == null) {
             this.ignoreProcessor = new CodegenIgnoreProcessor(this.config.getOutputDir());
         }
-
-        this.templateEngine = config.getTemplateEngine();
-
         return this;
     }
 
@@ -200,6 +197,8 @@ private void configureGeneratorProperties() {
             config.vendorExtensions().putAll(this.openAPI.getExtensions());
         }
 
+        this.templateEngine = config.getTemplateEngine();
+
         URL url = URLPathUtil.getServerURL(openAPI);
 
         contextPath = config.escapeText(url == null ? StringUtils.EMPTY : url.getPath());