JMC-6208 Fix font rendering on macOS

[Henrik Dafgård]

Hi all,

http://cr.openjdk.java.net/~hdafgard/6208/webrev.0/
https://bugs.openjdk.java.net/browse/JMC-6208

Font rendering on macOS Mojave regressed when Apple disabled subpixel font
rendering by default, but the root cause on our side was that we never
actually applied the anti-aliasing preferences in AwtCanvas, which was used
by the JFR GUI. This is why the Console GUI looks fine, since it gets a
graphics context in a different way and properly applies AA.


Regards,
Henrik Dafgård