VSCode launch.json has incorrect extension for new projects using the cli bundler

[Aquila Sands]

I'm submitting a bug report

• Library Version:
  1.0.0

Please tell us about your environment:

• Operating System:
  Windows10

• Node Version:
  12.3.1

• NPM Version:
  6.9.0

• Browser:
  n/a

• Language:
  all

• Loader/bundler:
  RequireJS

Current behavior:
Creating a new app or plugin which uses the built in cli bundler and VSCode as the editor places the file launch.json_if_cli-bundler in the .vscode directory. This cause VSCode debugging to not find the config until it is renamed to launch.json

• What is the expected behavior?
  The file has the correct extension .json

• Steps to reproduce.

  • Use au new to scaffold a new app or plugin using the custom option
  • Ensure that the built in cli bundler and VSCode are selected
  • The resulting .vscode directory will have the incorrectly named launch.json

• What is the motivation / use case for changing the behavior?
  Debugging in VSCode should just work

[Chunpeng Huo]

My bad. Will fix the file name.