RFR: 7903907: JOL: Further cleanup in heapdump-estimates

[Aleksey Shipilev]

Looking more closely at the report, I don't think we need to see overly large alignments. This only adds visual noise to the report and makes it slower than it should be.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jol/pull/62/files
  Webrev: https://webrevs.openjdk.org/?repo=jol&pr=62&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903907
  Stats: 16 lines in 1 file changed: 1 ins; 9 del; 6 mod
  Patch: https://git.openjdk.org/jol/pull/62.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/62/head:pull/62

PR: https://git.openjdk.org/jol/pull/62