Add an option to not write a list of recently opened wallets to config file

[ghost]

Actual behavior

Open Any wallet saves recently opened in config file

Steps to reproduce

1. open any saved wallet
2. close wallet
3. launch/open wallet again automatically opens last opened wallet

Crash / debug logs

~/.electrum-firo/config

line:

    "recently_open": [
        "/home/amnesia/.electrum-firo/wallets/test"
    ],

Desired behavior

To have option in the preferences/settings to turn off:

write recently opened wallets to config file

like Feather (Monero wallet) has

(I'm not sure how to implement this or else I would have made a pull request. Feather is made with C++ and Electrum-Firo is using python)