[jdk11u-dev] RFR: 8300642: [17u,11u] Fix DEFAULT_PROMOTED_VERSION_PRE=ea for -dev

[Goetz Lindenmaier]

Use -ea in -dev.

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Commit messages:
 - Backport b3e16fc287b6656e0227b30e698f544c3998843d

Changes: https://git.openjdk.org/jdk11u-dev/pull/1673/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1673&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300642
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1673.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1673/head:pull/1673

PR: https://git.openjdk.org/jdk11u-dev/pull/1673