lightdm: fixed unlocking gnome-keyring

lightdm was updated to change back to symlinks to the xdm PAM service files again, using a
different PAM service name breaks automatic unlocking of
gnome-keyring via PAM (bnc#903744)

Fixed bugs
bnc#903744
lightdm does not automatically unlock gnome-keyring via PAM any more
Selected Binaries
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