RFR: 7106: Update to the release splash screen for JMC 8

[Marcus Hirt]

Splash with updated copyright year and "Early Access" removed.

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Commit messages:
 - 7106: Update to the release splash screen for JMC 8

Changes: https://git.openjdk.java.net/jmc/pull/203/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=203&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7106
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/203.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/203/head:pull/203

PR: https://git.openjdk.java.net/jmc/pull/203