RFR: 8361193: Test java/awt/Mixing/AWT_Mixing/MixingPanelsResizing.java fails on MacOS X

[Khalid Boulanouare]

Sets setOpaque for lightweight, and uses a compares colors with tolerance in MacOS X machines.

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Depends on: https://git.openjdk.org/jdk/pull/25971

Commit messages:
 - Removes test from Problem List
 - Fixes color comparison on for MacOS X

Changes: https://git.openjdk.org/jdk/pull/26166/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26166&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361193
  Stats: 19 lines in 2 files changed: 15 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/26166.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26166/head:pull/26166

PR: https://git.openjdk.org/jdk/pull/26166