Fix UploadWizard logging for reals

- schemas had to be added as dependencies
- EventLogging does not clobber $wgEventLoggingSchemas when it
  initializes, so there is no point in putting the declarations
  to clever places

Change-Id: I627ea141515ec757b34b43b2ca3f707eb5842e16
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/862
(cherry-picked from commit 8f501d7d500b0ba1db716514438704bbab5d7d81)