RFR: 7903798: apidiff: Fix .jcheck/conf setting for tags

[Jonathan Gibbons]

Please review a change to align apidiff tags with jdk tags

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Commit messages:
 - 7903798: apidiff: Fix .jcheck/conf setting for tags

Changes: https://git.openjdk.org/apidiff/pull/1/files
  Webrev: https://webrevs.openjdk.org/?repo=apidiff&pr=1&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903798
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/apidiff/pull/1.diff
  Fetch: git fetch https://git.openjdk.org/apidiff.git pull/1/head:pull/1

PR: https://git.openjdk.org/apidiff/pull/1