debian: fix media/ permissions

debian/scrutiny.postinst

@@ -20,6 +20,7 @@ case "$1" in
     chown $USER:$GROUP /var/log/$NAME
     chown $USER:$GROUP /var/lib/$NAME/collectstatic
     chown $USER:$GROUP /var/lib/$NAME/tenants
+    chown $USER:$GROUP /var/lib/$NAME/media
     # create a secret file
     SECRET_FILE=$CONFIG_DIR/secret
     if [ ! -f $SECRET_FILE ]; then