Don't autofill values when configuring the debugger for Flask or Django apps

[luabud]

When debugging Flask and Django applications, the extension tries to detect manage.py and app.py in the application, and if it finds it, it automatically fills its path in the launch.json file, isn't that correct?
When it fails to detect it, it gives the user the option to enter the path to the application, and it prefills with app.py for Flask and manage.py for Django. However, because it is already auto filled, users expect this to be the correct entry and therefore don't change that field. If users have to fill the value in, there are greater chances that they will be successful.

I think microsoft/vscode-python-debugger#161 would be more helpful than this, but we could do both.

[paulacamargo25]

I will close this issue because it will be covered in microsoft/vscode-python-debugger#161.