<Swing Dev> RFR: 8263977: GTK L&F: Cleanup duplicate checks in GTKStyle and GTKLookAndFeel

[Aleksey Shipilev]

SonarCloud reports a few minor problems in GTKStyle and GTKLookAndFeel: Correct one of the identical sub-expressions on both sides of operator "||".

-------------

Commit messages:
 - 8263977: GTK L&F: Cleanup duplicate checks in GTKStyle and GTKLookAndFeel

Changes: https://git.openjdk.java.net/jdk/pull/3121/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3121&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263977
  Stats: 3 lines in 2 files changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3121.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3121/head:pull/3121

PR: https://git.openjdk.java.net/jdk/pull/3121