Gen data updated

Signed-off-by: Václav Valíček <valicek1994@gmail.com>

tests/_support_data/gen-data.sh

@@ -21,6 +21,7 @@ do
 	echo ">> $repo"
 	cd $repo
 	for i in $(git for-each-ref --format="%(refname:short)" --no-merged=origin/HEAD refs/remotes/origin); do git switch --track $i; done
+	git branch -D test-head || true
 	cd ..
 done
 # recover submodules to initial state (branches will remain)