RFR: 8248381: Create a daemon thread for MonocleTimer

[John Neffenger]

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On Sat, 27 Jun 2020 16:14:36 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> On second thought, this seems more like a workaround than a fix.

This change just restores the thread daemon status to the way it was before in JavaFX 14, where `true` is passed to the
`Timer` constructor for "isDaemon - true if the associated thread should run as a daemon."

        if (timer == null) {
            timer = new java.util.Timer(true);
        }

I tried setting `task.cancel(true)` instead of `false` in the `_stop` method, but that didn't stop the non-daemon
thread.

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PR: https://git.openjdk.java.net/jfx/pull/256