Always create new task when launching WifiDialogActivity

Set doucmentLaunchMode to always for WifiDialogActivity.  Always
create new task when launching wifi dialog activity so it won't
try to open the existing one.

Test: Manual
Fixes: 133206261
Change-Id: If35f0ea8f6d2f6b94ff58b4508f73f265ca4b5dd
1 file changed