Follow-up I50cb3ed: Enable VisualEditor as a Beta Feature on maiwiki

As is standard for Wikipedias.

Depends on Id5c7091d in Parsoid being deployed.

Change-Id: I0c0b1c7e85a728a7dc0009ed07a31f3f072a97f7
Merge "Follow-up I50cb3ed: Enable VisualEditor as a Beta Feature on maiwiki"