fix: returns simple acitvity name instead of full class name

[marandaneto]

💡 Motivation and Context

Follow up #153
If there's no label on the activity and app, the class name is returned with the full package name.

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

[marandaneto]

cc @thisames