Fix profile disk space accounting bugs.

Profile data is only stored on internal storage (it doesn't move to
adoptable devices), so only count it when asking about internal
storage (which has a null UUID).

Also fix bug where "current" profile data was being double-counted
for apps.

Test: runtest -x frameworks/base/services/tests/servicestests/src/com/android/server/pm/InstallerTest.java
Bug: 36102172, 36101738
Change-Id: I22b82e8cfb3bf1be1155fb827a538c21f09d88eb