Fix crash due to lost activity.

Change-Id: I9d0c2941bf3d725c506b15a738e6ab41678d76d1
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e8ddf2d..fea3b01 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1351,7 +1351,7 @@
             </intent-filter>
         </activity>
 
-        <activity android:name=".CryptKeeper$Blank"
+        <activity android:name=".CryptKeeper$FadeToBlack"
             android:immersive="true"
             android:launchMode="singleTop"
             android:theme="@style/CryptKeeperBlankTheme"