uncrypt: package on non-data partition should follow the right path

Fix the accidental change of behavior in [1]. OTA packages not on /data
partition should still go through the path that has validity checks and
wipe_misc() steps.

[1]: commit eaf33654c1817bd665831a13c5bd0c04daabee02.

Change-Id: Ice9a049f6259cd2368d2fb95a991f8a6a0120bdd
1 file changed