Attempt to deflake NetworkAgentTest#testRejectedUpdates.

This test is highly flaky in presubmit with error messages that
look like:

java.lang.AssertionError: Did not receive callback after 200ms

The test itself looks correct, so it's possible that 200ms just
isn't enough time for the callbacks to be delivered. Set the
timeout to DEFAULT_TIMEOUT_MS like most of the other
TestableNetworkCallbacks in this class.

Fix: 218389790
Test: test-only change
Change-Id: Ie68356a48e9618e5fea3865aa06bfbfc457b89c4
diff --git a/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt b/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt
index 810d1c6..225602f 100644
--- a/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt
+++ b/tests/cts/net/src/android/net/cts/NetworkAgentTest.kt
@@ -472,7 +472,7 @@
 
     @Test
     fun testRejectedUpdates() {
-        val callback = TestableNetworkCallback()
+        val callback = TestableNetworkCallback(DEFAULT_TIMEOUT_MS)
         // will be cleaned up in tearDown
         registerNetworkCallback(makeTestNetworkRequest(), callback)
         val agent = createNetworkAgent(initialNc = ncWithAccessUids(200))