custom-error-definition rule does not validate against exported name

[MrHen]

The following passes linting:

exports.fooError = class FooError extends Error {
    constructor(error) {
        super(error);
        this.name = 'FooError';
    }
};

The name used in exports.fooError should match the name used in this.name = 'FooError';.

A commented out test was added as part of #188 to cover this scenario.

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