Fix a couple of errors in the config script.

debian/dump1090-flightaware.config

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-NAME=dump1090-config
+NAME=dump1090-flightaware
 CONFIGFILE=/etc/default/$NAME
 set -e
 . /usr/share/debconf/confmodule
@@ -80,7 +80,7 @@ db_input_verify() {
     else 
      # db_input was OK, but the value did not verify.
      # show an error message
-     db_input high dump1090-mutability/invalid-$VERIFY || true
+     db_input high dump1090-flightaware/invalid-$VERIFY || true
     fi
 
     # try again