fix(deck): Start Steam on the desktop in silent mode

Author: KyleGospo

Containerfile

@@ -265,6 +265,7 @@ RUN rm /usr/share/applications/winetricks.desktop && \
     ln -s /usr/bin/steamos-logger /usr/bin/steamos-warning && \
     mkdir -p "/etc/xdg/autostart" && \
     cp "/usr/share/applications/steam.desktop" "/etc/xdg/autostart" && \
+    sed -i 's@/usr/bin/steam-runtime  %U@/usr/bin/steam-runtime -silent %U@g' /etc/xdg/autostart/steam.desktop && \
     cp "/usr/share/ublue-os/firstboot/yafti.yml" "/etc/yafti.yml" && \
     sed -i 's/#HandlePowerKey=poweroff/HandlePowerKey=suspend/g' /etc/systemd/logind.conf && \
     sed -i 's@enabled=1@enabled=0@g' /etc/yum.repos.d/_copr_ublue-os-akmods.repo && \