fix indentation

Author: orronai

lms/templates/filetree.html

@@ -9,7 +9,7 @@
         </span>
       {% endif -%}
       </div>
-      <span class="indent" style="margin-left: {{ file.indent * 0.5 }}em"></span>
+      <span class="indent" style="margin-left: {{ file.indent * 0.8 }}em"></span>
       <span class="
       {%- if file.is_folder -%}
       fiv-viv fiv-icon-folder">