[wallet] Fix "null" backup file name. #2625
Merged
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New created wallets have no name set by default, thus why the
GetUniqueWalletBackupName
function returns "null", and the automatic backup process creates backup files with a name in the form of "null+date".Changed the label to "wallet_backup" instead of "null" if the wallet has no name, plus fixed the rolling functionality that was not cleaning old files.