Revert "Update launcher preview icons on themed icon update"

Revert submission 25242534-launcher-preview-update-themed-icon

Reason for revert: This change potentially breaks the launcher's database.

Reverted changes: /q/submissionid:25242534-launcher-preview-update-themed-icon

Change-Id: I90fd55695b24529752a82cb6bf001935204a53f7
3 files changed