Fix collation/indexing for i18n contacts

Fix issue of contacts appearing under wrong label--sort contacts by
sort key, not by label.

Fix handling of labels that require more than the first character
(eg Czech 'CH') by using entire sortkey--not just the first letter--
to determine label.

Bug:7351596
Change-Id: Iaabc63041540f621220d0463df3e0850684caa94
1 file changed