- Multithreaded Rendering should be changed pre profile and not globally

Steps to reproduce:

1. Open Build Profile window (File > Build Profiles)

2. Create an Android or iOS build profile and add a custom player settings (Press Customize player settings)

3. Change Normal Map Encoding > Rendering

Actual results: 

When changing the Multithreaded Rendering for a build profile, it's changing globally (for all profiles and for Project Settings > Player Settings).

Expected results: 

The Multithreaded Rendering should be changed for build profile only