Lint the `ArcanistSpellingDefaultData` class.

Summary:
Currently, the `ArcanistSpellingDefaultData` is marked with a `@nolint` annotation. This means that it doesn't get linted by any linters. Really, the intention here was to make sure that this file isn't linted by the `ArcanistSpellingLinter` linter.

Now that the `.arclint` file is more mature, we can easily just exclude this file from being linted //only// by the spelling linter, whilst allowing other linters to run.

Test Plan: Ran `arc lint`.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9432