Remove extra settings write on package replace

During a package replace for non-system packages, commitPackagesLocked
runs executeDeletePackagesLIF, followed by updateSettingsLI. Both methods
call Settings#writeLPr internally, causing the entire packages.xml file
to be re-generated twice in a row.

Removing the extra call typically saves 40-50ms on my mostly-empty Pixel 3
with a 1 MB /data/system/packages.xml. I assume the savings scale up with
slower hardware & more apps installed.

Bug: 138450974
Test: Manually verified packages.xml is identical after install
as compared to an unchanged build.
Change-Id: Ibeeec9e5ff1ca60c2368f4faab2f1d3ab3d3497e