Revert "Allow for both ids and sites/titles to be set for wbgetentities"

This reverts commit 713cd872d5e072e9b70deaea8b0cee6f2bdb44bf.

Change-Id: I935678bb5aada4c915549ce3fd9c6597e4784b20
Merge "Revert "Allow for both ids and sites/titles to be set for wbgetentities"" into mw1.22-wmf14