RFR: 8354273: Restore even more pointless unicode characters to ASCII

[Magnus Ihse Bursie]

As a follow-up to [JDK-8354213](https://bugs.openjdk.org/browse/JDK-8354213), I found some additional places where unicode characters are unnecessarily used instead of pure ASCII.

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Commit messages:
 - 8354273: Restore even more pointless unicode characters to ASCII

Changes: https://git.openjdk.org/jdk/pull/24567/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24567&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354273
  Stats: 9 lines in 6 files changed: 0 ins; 1 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/24567.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24567/head:pull/24567

PR: https://git.openjdk.org/jdk/pull/24567