RFR: 8357452: Remove code span highlight in JavaDoc default stylesheet

[Hannes Wallnöfer]

Please review a simple change to remove highlighting of code spans (background and padding) in the default JavaDoc stylesheet.

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Commit messages:
 - 8357452: Remove code span highlight in JavaDoc default stylesheet

Changes: https://git.openjdk.org/jdk/pull/25349/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25349&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357452
  Stats: 11 lines in 1 file changed: 0 ins; 11 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25349.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25349/head:pull/25349

PR: https://git.openjdk.org/jdk/pull/25349