RFR: 8201570: Get two bytes for the Linux input event type, not four

Mon Jun 29 11:34:02 UTC 2020

On Sat, 27 Jun 2020 00:12:41 GMT, John Neffenger <github.com+1413266+jgneff at openjdk.org> wrote:

> Fixes [JDK-8201570](https://bugs.openjdk.java.net/browse/JDK-8201570).

This fixes a bug that currently didn't cause any harm
(https://bugs.openjdk.java.net/browse/JDK-8201570?focusedCommentId=14172176) , but it's better to fix it now.

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Marked as reviewed by jvos (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/257