Fix ForeignDBViaLBRepo favicon

Due to the weird inheritance structure of the FileRepo tree,
ForeignDBViaLBRepo inherited the wrong getInfo behavior and
returned the favicon of the local wiki.

Change-Id: I4892247c0e4a2e05c9148efe089f0ff52459bbd0
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/253
Merge "Fix ForeignDBViaLBRepo favicon"