Remove a duplicate StorageGroup sync worker, merge both storage regions

It seems a second StorageGroup sync worker was added recently, but the old one was kept in. I've removed the old one since the new one seems to be better (as it doesn't rely on a `Thing`, just a map and ID).

On top of that, I've merged the two regions named Storage.

Source/Client/Syncing/Dict/SyncDictRimWorld.cs

@@ -1091,9 +1091,7 @@ public static class SyncDictRimWorld
                     return data.MpContext().map.storageGroups.groups.Find(g => g.loadID == loadId);
                 }
             },
-            #endregion
 
-            #region Storage
             {
                 (ByteWriter data, StorageSettings storage) => {
                     WriteSync(data, storage.owner);
@@ -1103,10 +1101,6 @@ public static class SyncDictRimWorld
                     return parent?.GetStoreSettings();
                 }
             },
-            {
-                (ByteWriter data, StorageGroup group) => WriteSync(data, group.members.First()),
-                (ByteReader data) => ReadSync<IStorageGroupMember>(data).Group
-            },
             #endregion
 
             #region Letters