Avoid unregistering the same receiver more than once.

Bug: 231496005
Test: atest com.android.cts.net.HostsideRestrictBackgroundNetworkTests
Ignore-AOSP-First: This will cherry-picked to AOSP later.
Change-Id: Iba17daa70f14bdee1d1a7d32cb9dc64623ba1d24
diff --git a/tests/cts/hostside/app2/Android.bp b/tests/cts/hostside/app2/Android.bp
index 01c8cd2..edfaf9f 100644
--- a/tests/cts/hostside/app2/Android.bp
+++ b/tests/cts/hostside/app2/Android.bp
@@ -23,6 +23,7 @@
     defaults: ["cts_support_defaults"],
     sdk_version: "test_current",
     static_libs: [
+        "androidx.annotation_annotation",
         "CtsHostsideNetworkTestsAidl",
         "NetworkStackApiStableShims",
     ],