parallel-letter-frequency: unlock by bank account

config.json

@@ -871,7 +871,7 @@
         "maps",
         "strings"
       ],
-      "unlocked_by": "hamming",
+      "unlocked_by": "bank-account",
       "uuid": "38a405e8-619d-400f-b53c-2f06461fdf9d"
     },
     {