First thing you should do is immediately go to MTO and get the address corrected, and keep your copy of the receipt.
Second would be to plead not guilty and ask for trial with officer present. Once you get your notice of trial, you can contact prosecutors office and ask for a meeting. If they won't give you a meeting, then you can just show up on your trial date and meet with prosecutor before the trial. At either of these meetings you would just say you are sorry and that you had forgotten to change it and show them that you have fixed the problem and that you are hoping they will drop the charge. Hopefully the prosecutor is in a good mood when you meet with them and they will drop it.
The police officer has no say what so ever about whether the charge gets dropped or not. Only the prosecutor can make that decision.