chore: React Supabase Todolist connector minor typing fix (#953)

Author: Chriztiaan

demos/react-supabase-todolist/src/library/powersync/SupabaseConnector.ts

@@ -124,7 +124,7 @@ export class SupabaseConnector extends BaseObserver<SupabaseConnectorListener> i
             result = await table.upsert(record);
             break;
           case UpdateType.PATCH:
-            result = await table.update(op.opData).eq('id', op.id);
+            result = await table.update(op.opData ?? {}).eq('id', op.id);
             break;
           case UpdateType.DELETE:
             result = await table.delete().eq('id', op.id);