RFR: 8339351: Remove duplicate line in FileMapHeader::print

[Kim Barrett]

Please review this trivial change to remove a duplicated line in
FileMapHeader::print that outputs the narrow_oop_base value a second time.

Testing: mach5 tier1

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Commit messages:
 - remove duplicate entry in FileMapHeader::print

Changes: https://git.openjdk.org/jdk/pull/20807/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20807&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339351
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20807.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20807/head:pull/20807

PR: https://git.openjdk.org/jdk/pull/20807