[jdk11u-dev] RFR: 8295641: Fix DEFAULT_PROMOTED_VERSION_PRE=ea for -dev

[Goetz Lindenmaier]

Properly set promoted version.

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Commit messages:
 - Backport 2f2b914794fd6fa6bf33fe49620e91bff1103f49

Changes: https://git.openjdk.org/jdk11u-dev/pull/1464/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1464&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295641
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1464.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1464/head:pull/1464

PR: https://git.openjdk.org/jdk11u-dev/pull/1464