wizardWalletInput: check wallet exists / pick correct default name #4116
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small bug, if you have
walletdir/username_1/username_1.keys
andwalletdir/username_2.keys
(but no folderusername_2
) the create a new wallet name will beusername_2
and fail ot save to file (as it exists already) , this patch adds a warning that the file already exists, and also prevents the default name from being wrong to begin with