Unrevert audio (#21330)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>

Content.Server/Antag/AntagSelectionSystem.cs

@@ -21,6 +21,7 @@ using Content.Shared.Mobs.Components;
 using Content.Server.Station.Systems;
 using Content.Server.Shuttles.Systems;
 using Content.Shared.Mobs;
+using Robust.Server.Audio;
 using Robust.Server.Containers;
 using Robust.Shared.Player;
 using Robust.Shared.Prototypes;