Turn off deprecated sdk dialog

.. for all flicker tests.

Test: presubmit
Bug: 297603927
Change-Id: Ia0c4d8a3293f6bfff528a8c03d6ff97d145b57a2
diff --git a/tests/FlickerTests/Notification/AndroidTestTemplate.xml b/tests/FlickerTests/Notification/AndroidTestTemplate.xml
index 4036858..9c6a17d3 100644
--- a/tests/FlickerTests/Notification/AndroidTestTemplate.xml
+++ b/tests/FlickerTests/Notification/AndroidTestTemplate.xml
@@ -8,6 +8,8 @@
     <option name="isolated-storage" value="false"/>
 
     <target_preparer class="com.android.tradefed.targetprep.DeviceSetup">
+        <!-- disable DeprecatedTargetSdk warning -->
+        <option name="run-command" value="setprop debug.wm.disable_deprecated_target_sdk_dialog 1"/>
         <!-- keeps the screen on during tests -->
         <option name="screen-always-on" value="on"/>
         <!-- prevents the phone from restarting -->