backup-files: Separate function restore_all

Move the code to restore all files from a backup directory to a
separate function. This only duplicates a small amount of code, and
makes the code clearer. This will also allow further optimizations of
the specific use case of "quilt pop".

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Raphael Hertzog <hertzog@debian.org>

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