This will remove that annoying little Wifi Reminder. I have tested this on my phone with 0 issues.
•You will need root
•You will a SQLite editor
1.Open Settings Storage > db > secure
2.Search for “wifi_networks_available_notification_on” (different providers will be different line numbers)
3.Edit that record to read a value of 0 < (that's a ZERO)
4.Reboot your phone
How to remove WIFI Popup Notification:
Click 'new shortcut'
use new home screen shortcut to turn it off
Thanks to tillithz