RFR: 8300405: Screen capture for test JFileChooserSetLocationTest.java, failure case

[Tejesh R]

This is a diagnostic update related to [JDK-8295804](https://bugs.openjdk.org/browse/JDK-8295804). The issue was not reproducible and was showing up in particular machines (Where the machines are down now). So adding a screen capture to `BufferedImage` in case of failure so that it will help in analysis when the issue comes up in future.

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Commit messages:
 - Diagnostic approach

Changes: https://git.openjdk.org/jdk/pull/12060/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12060&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300405
  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12060.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12060/head:pull/12060

PR: https://git.openjdk.org/jdk/pull/12060