steamos: disable steam deck cmdlineConfig for non-steamdeck hosts

hosts/patiodeck/default.nix

@@ -35,4 +35,10 @@
   ];
 
   jovian.devices.steamdeck.enable = true;
+
+  # opt back into the SteamOS kernel cmdline (amd_iommu=off, lockup_timeout,
+  # sched_hw_submission=4, dcdebugmask=0x20000, ttm.pages_min, audit=0).
+  # desktop-jovian.nix defaults this to false to keep the Deck-tuned amdgpu
+  # params off RDNA3 desktops (yarn); patiodeck IS a Deck so it wants them.
+  jovian.steamos.enableDefaultCmdlineConfig = true;
 }