Replace duplicate beginResetModel with endResetModel

The initialize method was calling beginResetModel twice without
a corresponding endResetModel call. This could cause model state
inconsistencies.

src/app/models/serverlistmodel.cpp

@@ -176,7 +176,7 @@ void ServerListModel::initialize()
         true,
         false,
     });
-    beginResetModel();
+    endResetModel();
 }
 
 #include "moc_serverlistmodel.cpp"