Fix avatar masks were generated in the controller instead of the container

Packages/dev.hai-vr.animator-as-code.v1/V1/Editor/Aac.cs

@@ -233,10 +233,7 @@ namespace AnimatorAsCode.V1
         /// Set the Avatar Mask of the layer to be an Avatar Mask that allows the specified transforms. If `paths` is an empty array, all transforms are denied, which is effectively the same as calling `.WithAvatarMaskNoTransforms()`. The asset is generated into the container.
         public AacFlLayer ResolveAvatarMask(Transform[] paths)
         {
-            // FIXME: Fragile
-            var avatarMask = new AvatarMask();
-            avatarMask.name = "zAutogenerated__" + _configuration.AssetKey + "_" + _fullLayerName + "__AvatarMask";
-            avatarMask.hideFlags = HideFlags.None;
+            var avatarMask = AacInternals.NewAvatarMask(_configuration, _fullLayerName);
 
             if (paths.Length == 0)
             {
@@ -260,8 +257,6 @@ namespace AnimatorAsCode.V1
                 avatarMask.SetHumanoidBodyPartActive((AvatarMaskBodyPart) i, false);
             }
 
-            AssetDatabase.AddObjectToAsset(avatarMask, _animatorController);
-
             WithAvatarMask(avatarMask);
 
             return this;