fix: client writing to NetworkVariable inside ServerCharacterMovement (#517)

* setting networkvariable is wrapped in a server check

* guarding fixedupdate entirely

Author: fernando-cortez

Assets/BossRoom/Scripts/Server/Game/Character/ServerCharacterMovement.cs

@@ -151,6 +151,11 @@ public void Teleport(Vector3 newPosition)
 
         private void FixedUpdate()
         {
+            if (!IsServer)
+            {
+                return;
+            }
+
             PerformMovement();
 
             m_NetworkCharacterState.MovementStatus.Value = GetMovementStatus();