Only movedex() when working with apps-on-SD.

Partial revert of earlier change that tried doing movedex() during
a package upgrade.  Verified that the normal package upgrade path
already wipes old code as part of InstallArgs.cleanUpResourcesLI().

Change-Id: Icc5ae0d2718a0c494bfe7becf72df50c641efe1b
1 file changed