Use startActivityDismissingKeyguard to show vpn setting page in keyguard

Fix: 29200690

Change-Id: I47ff08ce379b985abf84cd931f7f83e918acc5f8
diff --git a/packages/SystemUI/src/com/android/systemui/qs/QSFooter.java b/packages/SystemUI/src/com/android/systemui/qs/QSFooter.java
index 51efbf0..932b4f5 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/QSFooter.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/QSFooter.java
@@ -127,7 +127,7 @@
     public void onClick(DialogInterface dialog, int which) {
         if (which == DialogInterface.BUTTON_NEGATIVE) {
             final Intent settingsIntent = new Intent(ACTION_VPN_SETTINGS);
-            mContext.startActivityAsUser(settingsIntent, UserHandle.CURRENT);
+            mHost.startActivityDismissingKeyguard(settingsIntent);
         }
     }