container: hledger-flow: remove potential % interpretation (printf)

Removes potential interpretation of percent signs in various types of
descriptions/notes/labels (otherwise, import may break).

Resolves "fatal: not enough arguments to satisfy format string" under
certain conditions.

container/src/hledger-flow/accounts/electrum/electrum-shared.bash

@@ -2,7 +2,7 @@
 
 # docker-finance | modern accounting for the power-user
 #
-# Copyright (C) 2021-2024 Aaron Fiore (Founder, Evergreen Crypto LLC)
+# Copyright (C) 2021-2025 Aaron Fiore (Founder, Evergreen Crypto LLC)
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -44,7 +44,10 @@ function parse()
          next
 
        printf $1 OFS                   # transaction_hash
+
+       sub(/%/, "%%", $2)
        printf $2 OFS                   # label
+
        printf $3 OFS                   # confirmations
 
        # value (without fee)