Replaced existing `slowImageURL` address to a new image (+ some extra bits related to it). Image has been taken from open-source repository of Duke images and licensed under BSD license: https://wiki.openjdk.org/display/duke/Gallery
------------- Commit messages: - Change slow image link to new one Changes: https://git.openjdk.org/jfx/pull/1410/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1410&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8327482 Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod Patch: https://git.openjdk.org/jfx/pull/1410.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1410/head:pull/1410 PR: https://git.openjdk.org/jfx/pull/1410
