Revert "Migrate IDP_GRID_NAME usage to LauncherPrefs"

This reverts commit 6f9a57186c53fe3352a12a27e566ffff3c5c64e0.

Reason for revert: A Bug where only device preferences were being used, not the main shared preference file.

Bug: 269569568
Test: Verified this on device.
Change-Id: I8422b2d7073537bd46c3a91033bd2281bbd306b7
(cherry picked from commit df11959779ca08a48308d9e390eb5b3fdb4bbf35)
Merged-In: I8422b2d7073537bd46c3a91033bd2281bbd306b7
3 files changed