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registration: Actually set the merge strategy for $wgExtensionCredits

Authored by Legoktm.

Description

registration: Actually set the merge strategy for $wgExtensionCredits

$wgExtensionCredits is special and needs to be set in the
ExtensionRegistry. Also change the cache key so any bad cache entries
will be ignored.

Follows up 1ebb0f5659667f.

Change-Id: Iec08ab8d9ef7fe7cccde979530839ef553779658