Fix double title

Author: acsany

code-image-generator/source_code_step_03/templates/base.html

@@ -4,7 +4,6 @@
     <meta charset="utf-8"/>
     <meta name="viewport" content="width=device-width, initial-scale=1"/>
     <title>
-      Code to Image {% block title %}{% endblock %}
       Code to Image
       {% block title %}
       {% endblock title %}