templates: cleaned up whitespaces

src/templates/error.html

@@ -1,10 +1,10 @@
-{% extends "template.html" %}
+{% extends "template.html" -%}
 
-{% block content %}
+{% block content -%}
 <div class="container">
     <div class="important">
         Error<br>
 	<span>{{ errorcode }}</span>
     </div>
 </div>
-{% endblock %}
+{% endblock -%}