Remove duplicate lines

Remove duplicate lines DEFAULT_RECEIVER and DEFAULT RECIPIENT.

.env

@@ -1,10 +1,5 @@
 # If this is True, emails are not sent
 TESTING=False
-# This recipient always receives the emails regardless of which municipality is chosen
-# Default receiver for feedback that has no home municipality or the sender refuses to say
-DEFAULT_RECEIVER="[email protected]"
-ALWAYS_RECIPIENT="[email protected]"
-BACKUP_FILE="messages.backup"
 
 # Root path for where the app lives so that we can have it in example.org/ or
 # example.org/feedback/ or example.org/something/else/feedback