Fix changing package installer after rollback

When executing rollbacks, we now set the SessionParams installerPackageName
to the targetPackage installer instead of using the default which is the
calling package.

Test: atest RollbackTest with Ic85464583f7c6b0778d853a87670d250a42c33de in
succession works.
Bug: 112431924

Change-Id: Id115c2c0d6838d81213dfc0d186ef30e13d6f879