Set outside prediction flags on system/inputs to work without prediction.

This needs to be gone through more thoroughly but it works somewhat.

Content.Shared/Slippery/SharedSlipperySystem.cs

@@ -26,6 +26,9 @@ namespace Content.Shared.Slippery
         public override void Initialize()
         {
             base.Initialize();
+
+            UpdatesOutsidePrediction = true;
+
             SubscribeLocalEvent<SlipperyComponent, StartCollideEvent>(HandleCollide);
             SubscribeLocalEvent<NoSlipComponent, SlipAttemptEvent>(OnNoSlipAttempt);
         }