RFR: 8276179 removing unused font code - isInstalledFont

[Phil Race]

On Fri, 29 Oct 2021 15:10:35 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

> removing dead code.
> When looking into the font code, I've noticed that this code is no longer used, so I thought I should make a PR with a minor cleanup.

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/658