[lworld] Integrated: 8340977: Remove ignore tag from FieldAccessModify test

[Alex Menkov]

removed missed ignore tag

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Commit messages:
 - fix

Changes: https://git.openjdk.org/valhalla/pull/1253/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1253&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340977
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1253.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1253/head:pull/1253

PR: https://git.openjdk.org/valhalla/pull/1253