Fix broken behavior around ImportVCardActivity.

The Activity doesn't work when called from Activities outside
the app context (e.g. opening vCard file as an Email attachment).

I808129cf uses onStop() to detect screen orientation, which is
just wrong.

Bug: 3140101
Change-Id: Id4a67d4f1c4a763fdaca38f5301e6d661a5096b3
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f44edf3..b7dc064 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -534,6 +534,7 @@
 
         <!-- vCard related -->
         <activity android:name=".vcard.ImportVCardActivity"
+            android:configChanges="orientation"
             android:theme="@style/BackgroundOnly">
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />