<Swing Dev> RFR: 8263977: GTK L&F: Cleanup duplicate checks in GTKStyle and GTKLookAndFeel [v2]

[Aleksey Shipilev]

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

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Update copyrights

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3121/files
  - new: https://git.openjdk.java.net/jdk/pull/3121/files/285cefc5..2c434a57

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3121&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3121&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 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