Update sv_SE to treate 'W' as a distinct character (Bug 25036)

The 13th edition of Svenska Akademiens ordlista lists 'W' as a
distinct letter that sorts after 'V'. We adjust the sv_SE locale
(and tests) to match this updated and "reformed" language change.
This harmonizes us with CLDR 1.5.0 (2007) for sv_SE sorting of
the letter 'W'.

No regressions on x86_64, and locale sorting tests all pass.

Co-authored-by: Carlos O'Donell <carlos@redhat.com>