Revert "test: coverage for wfWikiID()"

Introduces broken test that doesn't pass regression or HHVM.

This reverts commit 4f55b804f20960e039671a3dbf3f3eb4a5a4b81e.

Change-Id: Ib82cc9b89e7392b752e9ef98134e90186e371247
Merge "Revert "test: coverage for wfWikiID()""