Cleanup remaining IMapManager.MapExists uses (#37851)

Cleanup remaining IMapManager.MapExists uses

Content.Shared/Explosion/Components/ActiveTimerTriggerComponent.cs

@@ -6,7 +6,7 @@ namespace Content.Shared.Explosion.Components;
 /// <summary>
 ///     Component for tracking active trigger timers. A timers can activated by some other component, e.g. <see cref="OnUseTimerTriggerComponent"/>.
 /// </summary>
-[RegisterComponent, NetworkedComponent]
+[RegisterComponent]
 public sealed partial class ActiveTimerTriggerComponent : Component
 {
     [DataField] public float TimeRemaining;