temoved template engine pick for scala generators

Author: HugoMario

src/main/java/io/swagger/codegen/v3/generators/scala/AbstractScalaCodegen.java

@@ -254,10 +254,4 @@ protected String stripPackageName(String input) {
         int lastIndexOfDot = input.lastIndexOf(".");
         return input.substring(lastIndexOfDot + 1);
     }
-
-    // todo: remove this once handlebar templates for this generator are implemented
-    @Override
-    protected void setTemplateEngine() {
-        templateEngine = new MustacheTemplateEngine(this);
-    }
 }