Fix standing-state collisions resetting (#7469)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/Standing/StandingStateComponent.cs

@@ -1,12 +1,7 @@
 using System;
 using Content.Shared.Sound;
-using Robust.Shared.Analyzers;
-using Robust.Shared.GameObjects;
 using Robust.Shared.GameStates;
-using Robust.Shared.Players;
 using Robust.Shared.Serialization;
-using Robust.Shared.Serialization.Manager.Attributes;
-using Robust.Shared.ViewVariables;
 
 namespace Content.Shared.Standing
 {
@@ -18,10 +13,16 @@ namespace Content.Shared.Standing
         [DataField("downSoundCollection")]
         public SoundSpecifier DownSoundCollection { get; } = new SoundCollectionSpecifier("BodyFall");
 
-        [ViewVariables]
         [DataField("standing")]
         public bool Standing { get; set; } = true;
 
+        /// <summary>
+        ///     List of fixtures that had vault-impassable prior to an entity being downed. Required when re-adding the
+        ///     collision mask.
+        /// </summary>
+        [DataField("vaultImpassableFixtures")]
+        public List<string> VaultImpassableFixtures = new();
+
         public override ComponentState GetComponentState()
         {
             return new StandingComponentState(Standing);