Fix ignoring export const cases

[ai]

Sorry, I was in a hurry in previous time and didn't add proper tests.

Now I fix the issue and add tests.

[github-actions]

Package Changes Through 96078a2

There are 1 changes which include eslint-plugin-prefer-let with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
eslint-plugin-prefer-let	4.2.1	4.2.2

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