Removes unnecessary and incorrect instant app installer overrides

This change removes priority overrides made when an intersplit
resolve is being made. It also removes unnecessary overrides
that are already set on the mInstantAppInstallerInfo default
ResolveInfo.

Change-Id: Ifbd7eda2f7df2fb3927447e8e9b8c91f992efe26
Fixes: 72408536
Test: manual - ensured intersplit launches work as expected
Test: atest EphemeralTest passes