Revert "Multi-threaded mob movement" (#12809)

Content.Shared/Movement/Components/InputMoverComponent.cs

@@ -1,6 +1,5 @@
 using Content.Shared.Movement.Systems;
 using Robust.Shared.GameStates;
-using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
 using Robust.Shared.Timing;
 
 namespace Content.Shared.Movement.Components
@@ -62,8 +61,8 @@ namespace Content.Shared.Movement.Components
         /// <summary>
         /// If we traverse on / off a grid then set a timer to update our relative inputs.
         /// </summary>
-        [ViewVariables(VVAccess.ReadWrite), DataField("lerpTarget", customTypeSerializer: typeof(TimeOffsetSerializer))]
-        public TimeSpan LerpTarget;
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float LerpAccumulator;
 
         public const float LerpTime = 1.0f;