Allow uca-sv@collation=standard to be a collation name.

Allow uca-sv@collation=standard to be a collation name.

The "standard" collation for Swedish sorts V and W
only as secondary differences. Compare this to
the "reformed" collation which sorts them
as separate letters. Which collation is default
for sv seems to vary on icu version, but for icu 4.8
(which wmf uses) reformed is default. svwikisource
wants to use the "standard" collation.

Change-Id: I051590cf687ddea2e2cd84203d6e8eed3a6efd99