kill IMPALA_EDIT flag

apps/amo/utils.py

@@ -166,7 +166,7 @@ def send_mail(subject, message, from_email=None, recipient_list=None,
 
     try:
         if white_list:
-            if settings.IMPALA_EDIT and perm_setting:
+            if perm_setting:
                 template = loader.get_template('amo/emails/unsubscribe.ltxt')
                 for recipient in white_list:
                     # Add unsubscribe link to footer

settings.py

@@ -1068,7 +1068,6 @@ UNLINK_SITE_STATS = True
 NEW_FEATURES = False
 
 # Impala flags.
-IMPALA_EDIT = True
 
 # Set to True if we're allowed to use X-SENDFILE.
 XSENDFILE = True