Fix firelock door init (#6384)

Content.Shared/Doors/Components/DoorComponent.cs

@@ -28,11 +28,9 @@ public sealed class DoorComponent : Component
     /// This should never be set directly.
     /// </remarks>
     [ViewVariables(VVAccess.ReadWrite)]
+    [DataField("state")]
     public DoorState State = DoorState.Closed;
 
-    [DataField("startOpen")]
-    public readonly bool StartOpen = false;
-
     #region Timing
     // if you want do dynamically adjust these times, you need to add networking for them. So for now, they are all
     // read-only.