Revert "Always set policies in DPM before checking whether they are active"

* The underlying bug in DPM was fixed by hackbod in
  I4ebe0ea0461222b65425b2c5438b646b572f18c8

This reverts commit 4f5d4e29a8.

src/com/android/email/SecurityPolicy.java

@@ -291,10 +291,6 @@ public class SecurityPolicy {
      * @return true if the requested policies are active, false if not.
      */
     public boolean isActive(PolicySet policies) {
-        // Since the DPM reports password failures erroneously, we add this workaround that
-        // ensures that our most recent aggregate policy is set before checking whether those
-        // policies are in force
-        setActivePolicies();
         int reasons = getInactiveReasons(policies);
         return reasons == 0;
     }