Update package names to store shard mapping correctly

Two lines referenced the "wmf" package, which made the SQL query
function complain about a missing shard mapping file, and that
file could not be updated with the update_shardmap command.
Changing these to reference "wmfdata" re-enables storage
and querying.

Bug: T261165
Change-Id: Id85737c631b68b386e911e6fd4c8c1ff67da9ba2