RFR: 8365425: [macos26] javax/swing/JInternalFrame/8160248/JInternalFrameDraggingTest.java fails on macOS 26

[Prasanta Sadhukhan]

Test compares specific pixels with expected color and needed color profile setting in macOS26 is not available it seems.
Since the pixel color difference is slightly off, I have added a tolerance which had been present in many other tests so it's not without precedent

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Commit messages:
 - 8365425: [macos26] javax/swing/JInternalFrame/8160248/JInternalFrameDraggingTest.java fails on macOS 26
 - 8365425: [macos26] javax/swing/JInternalFrame/8160248/JInternalFrameDraggingTest.java fails on macOS 26
 - 8365425: [macos26] javax/swing/JInternalFrame/8160248/JInternalFrameDraggingTest.java fails on macOS 26

Changes: https://git.openjdk.org/jdk/pull/26833/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26833&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365425
  Stats: 12 lines in 1 file changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26833.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26833/head:pull/26833

PR: https://git.openjdk.org/jdk/pull/26833