This line was added in 9eebfbcac5
and I can't tell what it was supposed to do (that commit's message
only says "Fix NWE-only edit tab", thanks a lot).
Since then the init code was refactored a lot, at some point this
line was moved to be a part of a completely different check (???),
and now it's causing visual mode to be disabled even though the
user only set their preferences to *prefer* wikitext mode.
Bug: T243723
Change-Id: I3c1f502c3cd079fc5eeb2e9587b22d854ae3a72c
387e0d3cb3