Reference the same files as the compiler

[Jack Bates (jablko)]

types-publisher always resolves non-relative imports relative to the current older-version directory, e.g. import { createRenderer } from 'react-test-renderer/shallow'; -> types/react-test-renderer/v15/shallow/index.d.ts. This implies a "react-test-renderer/*": ["react-test-renderer/v15/*"] path mapping, or the compiler will look in the latest-package directory instead (types/react-test-renderer/shallow/index.d.ts).

This PR ensures that the path mapping is there. The error is roughly cribbed from

types-publisher/src/lib/definition-parser.ts

Lines 383 to 388 in dd69e3b

	if (directoryVersion !== undefined && !(paths && packageName in paths)) {
	const mapping = JSON.stringify([`${packageName}/v${formatTypingVersion(directoryVersion)}`]);
	throw new Error(
	`${packageName}: Older version ${formatTypingVersion(directoryVersion)} must have a "paths" entry of "${packageName}": ${mapping}`,
	);
	}

[Nathan Shively-Sanders (sandersn)]

Same comment as your other fixes. Can you add a test for this, and port it to microsoft/DefinitelyTyped-tools?