[jdk17u-dev] RFR: 8300642: Fix DEFAULT_PROMOTED_VERSION_PRE=ea for -dev

[Goetz Lindenmaier]

Simple version change for ea builds in -dev.

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Commit messages:
 - 8300642: Fix DEFAULT_PROMOTED_VERSION_PRE=ea for -dev

Changes: https://git.openjdk.org/jdk17u-dev/pull/1085/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1085&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/jdk17u-dev/pull/1085.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1085/head:pull/1085

PR: https://git.openjdk.org/jdk17u-dev/pull/1085