RFR: 8362067: Remove unnecessary List.contains key from SpringLayout.Constraints.pushConstraint

[Andrey Turbanov]

There is no need to call `List.contains` before `List.remove` call.
`history` is an either `horizontalHistory` or `verticalHistory`. Both of them are ArrayList's.

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Commit messages:
 - [PATCH] Remove unnecessary List.contains key from SpringLayout.Constraints.pushConstraint

Changes: https://git.openjdk.org/jdk/pull/24852/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24852&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362067
  Stats: 5 lines in 1 file changed: 0 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24852.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24852/head:pull/24852

PR: https://git.openjdk.org/jdk/pull/24852