RFR: 8372277: Fix for JDK-8369517 is applied starting from source 24 instead of 26

[Vicente Romero]

Change for [1]  had a bug, basically the code was referring to the wrong `Source.Feature` element, this is being corrected in this fix.

TIA

[1] https://bugs.openjdk.org/browse/JDK-8369517

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Commit messages:
 - 8372277: Fix for JDK-8369517 is applied starting from source 24 instead of 26

Changes: https://git.openjdk.org/jdk/pull/28434/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28434&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372277
  Stats: 8 lines in 4 files changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/28434.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28434/head:pull/28434

PR: https://git.openjdk.org/jdk/pull/28434