RFR: 8342602: Remove JButton/PressedButtonRightClickTest test

[Alexey Ivanov]

The `javax/swing/JButton/PressedButtonRightClickTest.java` test that was added by [JDK-8049069](https://bugs.openjdk.org/browse/JDK-8049069) fully duplicates an existing test `javax/swing/JButton/bug4490179.java`.

To save time running tests, I'm removing `PressedButtonRightClickTest.java`.

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Commit messages:
 - 8342602: Remove JButton/PressedButtonRightClickTest test

Changes: https://git.openjdk.org/jdk/pull/21587/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21587&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342602
  Stats: 148 lines in 2 files changed: 0 ins; 147 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21587.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21587/head:pull/21587

PR: https://git.openjdk.org/jdk/pull/21587