Partially revert ag/31525412

This CL partially reverts ag/31525412 because the change in Icon.kt
seems to have broken the QS icon drawing (see b/394738023).

Note that this CL is now using `remember` to remember the drawable
bitmap, to avoid unnecessary work during composition.

Bug: 394738023
Test: Manual, observed that the icon is now centered and sized correctly
Flag: EXEMPT bug fix
Change-Id: I5d4dc7288850645c7650c2cd9097dee948cbd29a