ConcurrencyTest: re-enable WiFi during teardown

Bug: 26182816
Change-Id: I3d5704794b17e0ec536a979a544a97a3e1f7b5c7
(cherry picked from commit f79ef7ff21ca9301035b9130d2d864112e8f9ae3)
diff --git a/tests/cts/net/src/android/net/wifi/cts/ConcurrencyTest.java b/tests/cts/net/src/android/net/wifi/cts/ConcurrencyTest.java
index 5accd77..343c1e6 100644
--- a/tests/cts/net/src/android/net/wifi/cts/ConcurrencyTest.java
+++ b/tests/cts/net/src/android/net/wifi/cts/ConcurrencyTest.java
@@ -94,8 +94,8 @@
         }
         mContext.unregisterReceiver(mReceiver);
 
-        if (mWifiManager.isWifiEnabled()) {
-            assertTrue(mWifiManager.setWifiEnabled(false));
+        if (!mWifiManager.isWifiEnabled()) {
+            assertTrue(mWifiManager.setWifiEnabled(true));
             Thread.sleep(DURATION);
         }
         super.tearDown();