RFR: 7903135: Correct license file

Fri Mar 25 22:48:52 UTC 2022

On Fri, 25 Mar 2022 16:35:50 GMT, Dmitry Bessonov <dbessono at openjdk.org> wrote:

> The JT Harness repository doesn't have a LICENSE file.
> It contains `legal/license.txt`.
> We need to place a proper LICENSE file to the repository root.

Were/are there any downstream uses of the `legal/license.txt` version of the file? 
i.e. did it get copied into product bundles at all?

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PR: https://git.openjdk.java.net/jtharness/pull/26