make sure to use cached convos for sync logic

otherwise the whole app freezes on a big database

ts/session/utils/syncUtils.ts

@@ -50,8 +50,7 @@ export const syncConfigurationIfNeeded = async () => {
     return;
   }
 
-  const allConvoCollection = await getAllConversations();
+  const allConvos = getConversationController().getConversations();
-  const allConvos = allConvoCollection.models;
 
   const configMessage = await getCurrentConfigurationMessage(allConvos);
   try {