sane-backends: fix udev rules for normal users accessing SCSI scanners

Fixed udev rules for SCSI scanners in
/etc/udev/rules.d/55-libsane.rules (for SCSI scanners using
"ATTRS" is mandatory therein) so that normal users who are
logged in directly at the local machine can access SCSI
scanners (see openSUSE Bugzilla bnc#681146).

Fixed bugs
bnc#681146
udev rules for SCSI-scanners do no longer match. Users cannot scan, only root can do that.
Selected Binaries
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