RFR: 8273638: javax/swing/JTable/4235420/bug4235420.java fails in GTK L&F

[Sergey Bylokhov]

As discussed here https://github.com/openjdk/jdk/pull/1813 the test should skip the GTK L&F unfortunately the name of the GTK L&F is "GTK look and feel" not "GTK". The ID="GTK" can be used instead.

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Commit messages:
 - Update bug4235420.java

Changes: https://git.openjdk.java.net/jdk/pull/5485/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5485&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273638
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5485.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5485/head:pull/5485

PR: https://git.openjdk.java.net/jdk/pull/5485