fix(voice): Fixed syntax for setting action on some NCCOs

[dragonmantank]

Description

Some of the NCCO actions had their action property set to undefined because the typehint was set to the value, not the property. This corrects that.

Motivation and Context

This generated invalid NCCOs for these types

Testing Details

Example Output or Screenshots (if appropriate)

Code:

builder.addAction(new Talk("Hello"));
builder.addAction(
  new Stream("https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3")
);

console.log(builder.build());

Output:

[
  Talk {
    action: 'talk',
    text: 'Hello',
    bargeIn: undefined,
    loop: undefined,
    level: undefined,
    language: undefined,
    style: undefined,
    premium: undefined
  },
  Stream {
    action: undefined, <--- Invalid action
    streamUrl: [ 'https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3' ],
    level: undefined,
    bargeIn: undefined,
    loop: undefined
  }
]

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[manchuck]

With #838 this is addressed with an Enum.