Security update for sddm

This update for sddm fixes the following issue:

- Fix X not having access control on startup (boo#1177201, CVE-2020-28049).

Fixed bugs
bnc#1177201
VUL-0: CVE-2020-28049: xorg-x11-server: Xorg with -auth and -displayfd starts up without access control
Selected Binaries
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