Fix tests deleting XDG_DATA_HOME

That includes ~/.local/share/keyrings which was the most immediatelly
visible effect.

Signed-off-by: Carlos Lima <carlos@cpan.org>

pkg/plugin/installer/local_installer_test.go

@@ -20,12 +20,14 @@ import (
 	"path/filepath"
 	"testing"
 
+	"helm.sh/helm/v4/internal/test/ensure"
 	"helm.sh/helm/v4/pkg/helmpath"
 )
 
 var _ Installer = new(LocalInstaller)
 
 func TestLocalInstaller(t *testing.T) {
+	ensure.HelmHome(t)
 	// Make a temp dir
 	tdir := t.TempDir()
 	if err := os.WriteFile(filepath.Join(tdir, "plugin.yaml"), []byte{}, 0644); err != nil {