Even though you have opted out of the beta program, you will find that the version of mac OS on your computer is still the beta one until there is a new update of the standard shipping version which will overwrite the beta version that you have.
EG if you had a beta version of 10.12.0, after opting out of the beta program, the update for 10.12.1 should bring you back to a standard version. Unfortunately for you, that would mean either waiting for a new mac OS update such as a 10.12.2 or reinstalling Mac OS.
Doing a refresh of the operating system (reinstalling mac OS but still keeping the files, so jump the wipe hard disk step here- How to reinstall macOS - Apple Support) didn't work for me when I tried it last year to get back to a standard version of EL Capitan, so think the only certain way to get back to a shipping version of Mac OS is to reinstall it completely. However that will wipe everything, so unless you have everything in iCloud, then it can be a bit of a pain copying files to a portable hard drive and the copying them back again to the computer. See here for more on that- How to reinstall macOS - Apple Support
Before you do anything drastic, try going into display preferences > colour and changing the colour profile from 'colour LCD' to SRGB, they display exactly the same colours as the MacBook pro uses the SRGB colour space natively so you wont see a difference there, though there is a small chance that switching to SRGB will fix the issue. Anyway, worth a try before doing anything more drastic.
I hope this helps!
