Fix mech double interactions (#14672)

Content.Shared/Mech/EntitySystems/SharedMechSystem.cs

@@ -125,6 +125,7 @@ public abstract class SharedMechSystem : EntitySystem
         if (pilot == null)
             return;
 
+        // TODO why is this being blocked?
         if (!_timing.IsFirstTimePredicted)
             return;
 
@@ -165,6 +166,8 @@ public abstract class SharedMechSystem : EntitySystem
 
         var rider = EnsureComp<MechPilotComponent>(pilot);
         var relay = EnsureComp<RelayInputMoverComponent>(pilot);
+
+        // Warning: this bypasses most normal interaction blocking components on the user, like drone laws and the like.
         var irelay = EnsureComp<InteractionRelayComponent>(pilot);
 
         _mover.SetRelay(pilot, mech, relay);