Removes exported="true" for RecentsActivity.

Change-Id: Iea9ad04886c3221cefa709c14b6501b2af83af06
diff --git a/quickstep/AndroidManifest.xml b/quickstep/AndroidManifest.xml
index 7ce4d74..a06a2dd 100644
--- a/quickstep/AndroidManifest.xml
+++ b/quickstep/AndroidManifest.xml
@@ -47,10 +47,7 @@
             </intent-filter>
         </service>
 
-        <!-- STOPSHIP: Change exported to false once all the integration is complete.
-        It is set to true so that the activity can be started from command line -->
         <activity android:name="com.android.quickstep.RecentsActivity"
-            android:exported="true"
             android:excludeFromRecents="true"
             android:launchMode="singleTask"
             android:clearTaskOnLaunch="true"