Exclude SipCallOptionHandler from recents

This is not an activity with UI and should not appear in recents.

bug:11257436
Change-Id: I6009379ad2771dce7a81272ce8f90717b9f52b6a
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 5615b85..62c01a6 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -490,7 +490,8 @@
         <activity android:name=".SipCallOptionHandler"
                 android:theme="@style/SipCallOptionHandlerTheme"
                 android:screenOrientation="nosensor"
-                android:configChanges="orientation|screenSize|keyboardHidden">
+                android:configChanges="orientation|screenSize|keyboardHidden"
+                android:excludeFromRecents="true">
         </activity>
 
         <activity android:name="RespondViaSmsManager$Settings"