Fix LinkPropertiesTest on *-user builds

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2091763

Bug: 229813087
Merged-In: I21435cd6cb5c43074eef95e8896c02652ffea216
Change-Id: I35686520d92c18b10e43d25904bc0d6b4246daac
diff --git a/tests/cts/net/AndroidManifest.xml b/tests/cts/net/AndroidManifest.xml
index 3b47100..6b5bb93 100644
--- a/tests/cts/net/AndroidManifest.xml
+++ b/tests/cts/net/AndroidManifest.xml
@@ -44,7 +44,8 @@
              android.permission.MANAGE_TEST_NETWORKS
     -->
 
-    <application android:usesCleartextTraffic="true">
+    <application android:debuggable="true"
+                 android:usesCleartextTraffic="true">
         <uses-library android:name="android.test.runner" />
         <uses-library android:name="org.apache.http.legacy" android:required="false" />
     </application>