RFR: JDK-8310975 java.util.FormatItemModifier should not be protected

[Jim Laskey]

The nested class is incorrectly marked as protected.

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Commit messages:
 - Remove protected from FormatItemModifier

Changes: https://git.openjdk.org/jdk/pull/14681/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14681&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310975
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14681.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14681/head:pull/14681

PR: https://git.openjdk.org/jdk/pull/14681