Fix bad conditional
Fix bad conditional

The $instance_configured value is either 'true' or 'false' so you
don't need the [] test here. It'll actually evaluate to true since a
single argument test just checks for non-emptyness:

    % [ false ]
    % echo $?
    0

vs.

    % false
    % echo $?
    1

github/backup-utils,github/backup-utils,spotify/backup-utils,Teino1978-Corp/https-github.com-Teino1978-Corp-backup-utils