RFR: 8235364: Update copyright header for files modified in 2019

[Ambarish Rapte]

On Thu, 19 Dec 2019 22:47:07 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Update the last-modified year in the copyright header to 2019 for files that were modified this year without updating the year in the copyright header.

The change looks good.

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Marked as reviewed by arapte (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/72