Fix the new rule snippet to not create an immediately broken file

[ChrisMBarr]

I wanted to create a new rule for this project, so I followed the instructions and ran

grunt create-rule --rule-name=my-new-rule

which created a broken rule file that I had to figure out why it was broken before I could start developing. This PR should fix the incorrect path to tslint and add the missing required properties to the metadata class member.

Perhaps some tests should be added for this project that creates a rule with this command and ensures that it can be compiled?

[msftclas]

@ChrisMBarr, thanks for signing the contribution license agreement. We will now validate the agreement and then the pull request.

Thanks, Microsoft Pull Request Bot

[HamletDRC]

Thanks for noticing and fixing!