[PATCH/SECURITY] Fix unsafe permissions for config-private

[Albrecht Dreß <albrecht dress arcor de>]

Hi all,

the $HOME/.balsa/config-private file is saved with default permissions which may leave it (and the obfuscated 
passwords within it) group or world readable.  This should be regarded as a security hazard.

The attached simple patch ensures that the permissions are 0600 after saving it.

Cheers,
Albrecht.

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