Fix Terminal method call - use t.Vprint instead of t.Printf

- Terminal type doesn't have Printf method, only Print/Vprint/Vprintf
- Use t.Vprint with string concatenation following codebase patterns
- Resolves build error: 't.Printf undefined'

Co-Authored-By: Alec Fong <alecsanf@usc.edu>

Author: devin-ai-integration[bot]

pkg/cmd/open/open.go

@@ -122,7 +122,7 @@ func handleSetDefault(t *terminal.Terminal, editorType string) error {
 		return breverrors.WrapAndTrace(err)
 	}
 
-	t.Printf(t.Green("Default editor set to %s\n"), editorType)
+	t.Vprint(t.Green("Default editor set to " + editorType + "\n"))
 	return nil
 }