Refresh authenticator info when accounts change.

There may be newly installed authenticators, so refresh them when
accounts change.

Bug: 7280043
Change-Id: Ic173970c815950526c77a2653e7fae4551948f13
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index c2b5cc1..9c7f848 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -750,6 +750,8 @@
 
     @Override
     public void onAccountsUpdated(Account[] accounts) {
+        // TODO: watch for package upgrades to invalidate cache; see 7206643
+        mAuthenticatorHelper.updateAuthDescriptions(this);
         mAuthenticatorHelper.onAccountsUpdated(this, accounts);
         invalidateHeaders();
     }