Revert "Fixing the comment mail templates"

This reverts commit 5c04d51e.

bt/templatetags/bt.py

@@ -8,7 +8,7 @@ register = Library()
 
 @register.simple_tag
 def root_url():
-    return ''.join([settings.DOMAIN_NAME,settings.ROOT_URL])
+    return settings.ROOT_URL
 
 @register.simple_tag
 def media_url():