Bugfix rules/named-export: False positive detection of ExportNamedDeclaration in TSModuleBlock

[epaew]

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About the pull request

The rule named-export reports the warning "The export name must match the filename. You need to rename to Espree or espree" with below case;

• @types/espree.d.ts

/// <reference types="estree" />

declare module 'espree' {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  export function parse(code: string, options?: any): Node;
}

But this behavior is not what I expected, so I fix it.

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[codeclimate]

Code Climate has analyzed commit 2c36015 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (60% is the threshold).

This pull request will bring the total coverage in the repository to 94.4% (0.0% change).

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