Update help-text regarding location of the local SQLite database (ver. 4.4.1)

[BWWIT]

The help-text state the following'

..
Otherwise:
    • B2_ACCOUNT_INFO env var's value, if set
    • ~/.b2_account_info, if it exists          <---------- THIS LINE SEEMS WRONG!
    • XDG_CONFIG_HOME/b2/account_info, if XDG_CONFIG_HOME env var is set
    • ~/.b2_account_info, as default
..

~/.b2_account_info should be ~/.config/b2/account_info