wifi: fix testWifiManagerActions test failure

WifiManager#pingSupplicant is deprecated and its semantics had changed.
So remove it in testWifiManagerActions to fix the test.

Bug: 37991667
Test: cts-tradefed run cts-dev --module CtsNetTestCases --test
      android.net.wifi.cts.WifiManagerTest#testWifiManagerActions

Change-Id: I9b64cb6d03c253f143a78caca72b75678973034b
diff --git a/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java b/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
index 14ae1b4..e888c14 100644
--- a/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
+++ b/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
@@ -239,11 +239,10 @@
         assertTrue(mWifiManager.reconnect());
         assertTrue(mWifiManager.reassociate());
         assertTrue(mWifiManager.disconnect());
-        assertTrue(mWifiManager.pingSupplicant());
         startScan();
         setWifiEnabled(false);
         Thread.sleep(DURATION);
-        assertTrue(mWifiManager.pingSupplicant() == mWifiManager.isScanAlwaysAvailable());
+        assertTrue(mWifiManager.isScanAlwaysAvailable());
         final String TAG = "Test";
         assertNotNull(mWifiManager.createWifiLock(TAG));
         assertNotNull(mWifiManager.createWifiLock(WifiManager.WIFI_MODE_FULL, TAG));