IcuCollation: Do not split $tailoringFirstLetters into verified/not verified
At this point I think it's safe to assume that these mostly work well,
and the split makes maintenance of the alphabetical list more difficult
(some entries were already in wrong order). We've been enabling these
collations for more and more Wikimedia wikis and not hearing about any
problems. Mistakes, if any are present, should be treated like any
other bug.
Also made some comments consistent.
Change-Id: I4b5fbcf4dbbdd4dc194ed821341296171fa64bb0