Revert "Remove preview refresh 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: I0a9395f9e5b1577fc9045709f99ca04ade2d7b8b
2 files changed