Hidden AddAccount activity doesn't need to deal with orientation changes.

Bug: 3300523
Change-Id: I53e02e390267b1a88a6ae424aca18df439501f6d
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e07f38e..334a9d9 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1064,6 +1064,7 @@
 
         <activity android:name="com.android.settings.accounts.AddAccountSettings"
             android:theme="@android:style/Theme.Translucent.NoTitleBar"
+            android:configChanges="orientation|keyboardHidden"
             android:label="@string/header_add_an_account">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />