falter-common: fix ffwizard uci script exit code

The config data already being present is not an error condition.

The script will only be deleted if it exits zero, which means
it will be retried on the next boot if it exits non-zero.

The other check (availability of the translation script)
is a legitimate error condition and we want to retry that.

Signed-off-by: Packet Please <pktpls@systemli.org>

packages/falter-common/files/etc/uci-defaults/freifunk-berlin-ffwizard3-json

@@ -10,7 +10,7 @@ fi
 
 # check, if there is the needed information already set
 if [ ! -f /etc/config/ffwizard ]; then
-    exit 1
+    exit 0
 fi
 
 # create a ffwizard3-file, if there is none already