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Only clear icon cache when theme/icon pack applied
Icon cache would get cleared on boot when applying the user's theme at startup which can negatively impact launchers when they are loading icons. Icon cache should persist as long as that icon pack is applied. Change-Id: I248e08cdc87a31c1718cbc53aed49891056300cc (cherry picked from commit 845f38c6) Ticket: CYNGNOS-751