IconCache - don't drop flags when adding items to the in memory cache.

The flags (like work profile and instant) were being dropped when an item
is added to the in memory cache from package icon loading.

Bug: 323398976
Test: Manual, checking after a language direction change
Flag: NA
Change-Id: Ideb9372874d275b90d4468c4c2397381120aca65
(cherry picked from commit c7d1c88ca35c0dd366a0b277fe43fa21962ba484)