Rollback SQLite migration to shared location

Summary: This differential rollbacks SQLite file migration from app-specific to app-groups location

Test Plan: Comment re-migration code and use getAppGroupSQLiteFilePath instead. Build the app, check that the path is an app group path. Then uncomment re-migration code, use getSQLiteFilePath and build the app. Check that it works and sqlite file path is app-specific and no database migration is executed. It is essential that app is not uninstalled between those two steps.

Reviewers: palys-swm, atul

Reviewed By: palys-swm

Subscribers: ashoat, Adrian, yayabosh

Differential Revision: https://phabricator.ashoat.com/D4180