Fix templates markup to prevent nesting of commit files diff blocks

Commit detail page improperly closes `.commit-diff` tags inside for-loop which results in diff blocks being nested within each other. This is best visible at large commits with lots of files and lots of changes - with increasing "indentation" from the left side as one scrolls down the long page.

templates/default_dark/commit.html

@@ -31,9 +31,9 @@ index {{file.oldid | truncate(length=7,end="")}}..{{file.newid | truncate(length
 {%- endfor -%}
 </pre>
 {% endfor -%}
+</div>
 <br/>
 {% endfor -%}
 {% endif -%}
 </div>
-</div>
 {% endblock content %}

templates/default_light/commit.html

@@ -31,9 +31,9 @@ index {{file.oldid | truncate(length=7,end="")}}..{{file.newid | truncate(length
 {%- endfor -%}
 </pre>
 {% endfor -%}
+</div>
 <br/>
 {% endfor -%}
 {% endif -%}
 </div>
-</div>
 {% endblock content %}