fix(cli): typo in changeset pre enter when tag is not passed

[kunalnagar]

When a tag is not passed in to changeset pre enter, the error message thrown as a typo:

$ yarn changeset pre enter
🦋  error A tag must be passed when using prerelese enter

This PR fixes the typo in prerelease and adds a test for it as well.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 68f6188

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[kunalnagar]

cc: @Andarist for review