fix: create core schema before making a first select request

Migration uses Finder to get the current table version.

winixd/core/app.cpp

@@ -287,6 +287,8 @@ bool App::DoDatabaseMigration()
 	Item item;
 	Group group;
 
+	migration.set_connector(model_connector);
+	migration.create_winix_schema();
 	ok = ok && Migration::do_migration(&model_connector, migration);
 	ok = ok && Migration::do_migration(&model_connector, user);