Remove local_dedupe_key from picker db

Since we are removing MEDIA_STORE_DEDUPLICATION_KEY from the
CloudMediaProvider API, we need to remove the equivalent key from the
picker db.

Now, deduping is only based on the local_id instead of <local_id,
local_dedupe_key>

Bug: 190713331
Test: PickerDatabaseHelperTest
Change-Id: I3b3bf2c570b02f5aaba818b4d0396ffef77ee01f
Merged-In: I3b3bf2c570b02f5aaba818b4d0396ffef77ee01f
(cherry picked from commit 7684ed24dbfc55a49f05ed1d33d22b10d3cd8c4c)
2 files changed