[STF] corrected test case

The ShareFilesFromOneProjectToMultipleRemoteProjects was first
triggering errors in Saros. While this was corrected long ago in the
business logic the UI was not updated until commit
3686ced1a816a408b89a678d2c836f6f2be995cf. The test case now accesses the
UI correctly.

Change-Id: I593d8c7e0a583e84c9f3630298c02fd5a5117122
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1643
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>