Extend timeout to deflake test

CaptivePortalLoginActivity may load the page slowly in lower
performance devices. Test expects the login page to be loaded
within 10s. The flaky happened sometimes since loading page
took 10+ seconds and failed the test.

Extend the timeout from 10s to 20s to deflake the test.

Bug: 225800341
Test: atest CaptivePortalTest
Change-Id: I98ab3dbc78cb95eeee95d1c86ab286600c98390b
diff --git a/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt b/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt
index a378aa7..0344604 100644
--- a/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt
+++ b/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt
@@ -77,7 +77,7 @@
 
 // Re-connecting to the AP, obtaining an IP address, revalidating can take a long time
 private const val WIFI_CONNECT_TIMEOUT_MS = 40_000L
-private const val TEST_TIMEOUT_MS = 10_000L
+private const val TEST_TIMEOUT_MS = 20_000L
 
 private const val TAG = "CaptivePortalTest"