RFR: 8309511: Regression test ExtraImportSemicolon.java refers to the wrong bug

[Archie Cobbs]

Please review this trivial fix for an incorrect `@bug` reference in `ExtraImportSemicolon.java`.

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Commit messages:
 - Fix incorrect @bug reference in regression test for JDK-8027682.

Changes: https://git.openjdk.org/jdk/pull/14327/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14327&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309511
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14327.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14327/head:pull/14327

PR: https://git.openjdk.org/jdk/pull/14327