cmdio: drop promptui name-drop from ssh setup test

Final stray reference outside the cmdiotest test branch — reword to
describe what the stub avoids (spawning a TUI) instead of naming
the removed dependency.

Co-authored-by: Isaac

Author: pietern

experimental/ssh/internal/setup/setup_test.go

@@ -295,7 +295,7 @@ func TestSetup_PromptsForClusterWhenNotProvided(t *testing.T) {
 	configPath := filepath.Join(tmpDir, "ssh_config")
 
 	// Replace the cluster picker with a stub returning a fixed ID. This lets the
-	// test exercise the empty-ClusterID path of Setup without driving promptui.
+	// test exercise the empty-ClusterID path of Setup without spawning a TUI.
 	origPrompt := clusterSelectionPrompt
 	t.Cleanup(func() { clusterSelectionPrompt = origPrompt })
 	promptCalled := false