Fix audio occlusion

This was previously being done on every SoundComponent.

Content.Client/Audio/ContentAudioSystem.cs

@@ -0,0 +1,15 @@
+using Content.Shared.Physics;
+using Robust.Client.GameObjects;
+using Robust.Shared.GameObjects;
+
+namespace Content.Client.Audio
+{
+    public sealed class ContentAudioSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            Get<AudioSystem>().OcclusionCollisionMask = (int) CollisionGroup.Impassable;
+        }
+    }
+}