Refactor permission checks removeActiveAdmin

Reorder permissions checks to not leak information about a package if
it's admin or not.

Bug: 192369136
Test: atest DevicePolicyManagerTest#testRemoveActiveAdmin_SecurityException
      atest DevicePolicyManagerTest#testRemoveActiveAdmin_userNotRunningOrLocked
      atest DevicePolicyManagerTest#testRemoveActiveAdmin_fromDifferentUserWithINTERACT_ACROSS_USERS_FULL
      atest DevicePolicyManagerTest#testRemoveActiveAdmin_sameUserNoMANAGE_DEVICE_ADMINS
      atest DevicePolicyManagerTest#testRemoveActiveAdmin_multipleAdminsInUser
      atest DevicePolicyManagerTest#testSetDeviceOwner
      atest DevicePolicyManagerTest#testSetDeviceOwner_headlessSystemUserMode
      atest DevicePolicyManagerTest#testSetProfileOwner
Change-Id: I132e09f680c06fb5068bdbe140c08cafcc13f102
Merged-In: I132e09f680c06fb5068bdbe140c08cafcc13f102
(cherry picked from commit 11d2fb77)