WifiSettings has leaked window

Fix for leaked window
Bug: 2311236
diff --git a/src/com/android/settings/wifi/WifiSettings.java b/src/com/android/settings/wifi/WifiSettings.java
index e5145c0..04f6aa4 100644
--- a/src/com/android/settings/wifi/WifiSettings.java
+++ b/src/com/android/settings/wifi/WifiSettings.java
@@ -192,6 +192,9 @@
         if (mWifiEnabler != null) {
             mWifiEnabler.pause();
         }
+        if (mDialog != null) {
+            mDialog.dismiss();
+        }
     }
 
     @Override