Remove redundant PHP values in PHP FPM conf (Fixes #395)

[jaydrogers]

Problem

• In our fpm* variations, PHP ini settings were being set on the FPM configuration and the PHP ini
• The FPM configuration would override any INI settings, even if you set them yourself

More Explanation in my video

Check this video out for more detail:

Solution

• [x] Remove the redundant FPM configurations setting the INI settings
• [x] Ensure any custom ini settings will always override any environment variable settings