Fix mountpoint list spacing
Fix mountpoint list spacing

The two spaces preceding the hyphen have been accidentally replaced by a
tab in https://github.com/resin-io-modules/drivelist/pull/120, causing
the YAML parser to get confused and not output any mountpoints.

Signed-off-by: Juan Cruz Viotti <4148f5869aa1bcd7efd85b513a5874967e585032@openmailbox.org>

resin-io/drivelist,resin-io-modules/drivelist,resin-io/drivelist,resin-io-modules/drivelist,resin-io-modules/drivelist,resin-io-modules/drivelist