[method-signature-style] Shouldn't affect methods that use this

Repro

{
  "rules": {
    "@typescript-eslint/method-signature-style": ["error"]
  }
}

interface Foo {
	cloneThis(): this; // ❌ reported
	cloneThis: () => this; //  🤔 fixed to this
}

Expected Result

Methods should not be affected, this should not be autofixed:

interface Foo {
	cloneThis(): this;
}

Actual Result

That type is changed to an arrow function, which doesn't have this

interface Foo {
	cloneThis: () => this; //  Fixed to this, broken
}

Additional Info

It causes errors elsewhere in the code

Versions

package	version
`@typescript-eslint/eslint-plugin`	`2.27.0`
`@typescript-eslint/parser`	`2.27.0`
`TypeScript`	`3.8.3`
`ESLint`	`6.8.0`
`node`	`13.8.0`
`npm`	`6.13.6`

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