Clean up all missing EntitySystem proxy method uses (#38353)

Content.Server/Arcade/BlockGame/BlockGameArcadeSystem.cs

@@ -29,7 +29,7 @@ public sealed class BlockGameArcadeSystem : EntitySystem
 
     public override void Update(float frameTime)
     {
-        var query = EntityManager.EntityQueryEnumerator<BlockGameArcadeComponent>();
+        var query = EntityQueryEnumerator<BlockGameArcadeComponent>();
         while (query.MoveNext(out var _, out var blockGame))
         {
             blockGame.Game?.GameTick(frameTime);