Add null character to default gremlins

[wulfsolter]

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Description

Add null character to defaults

Motivation and Context

Closes issue https://github.com/nhoizey/vscode-gremlins/issues/109 Null chars break text files in bash and other languages. Every time I reinstall vscode-gremlins I have to re-add this rule.

How Has This Been Tested?

Open file, see null gremlin, smile :)

Screenshots (if appropriate):

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.