Fixed AutoSavedStore's deletion of data when table was using composite keys.

Store/ChatterStore.cs

@@ -4,7 +4,7 @@ using HermesSocketServer.Store.Internal;
 
 namespace HermesSocketServer.Store
 {
-    public class ChatterStore : AutoSavedStore<string, ChatterVoice>
+    public class ChatterStore : ComplexAutoSavedStore<string, ChatterVoice>
     {
         private readonly string _userId;
         private readonly Database _database;
@@ -43,9 +43,5 @@ namespace HermesSocketServer.Store
         protected override void OnInitialModify(string key, ChatterVoice value)
         {
         }
-
-        protected override void OnInitialRemove(string key)
-        {
-        }
     }
 }