Fixes #1420: Correct wrong matrix transformation logic

[spschul]

Fixes #1420

Description of the changes:

• Honestly, I thought this was fixed years ago. As discussed in about green_screen example #1420 we have an incorrect transformation in the green screen example, this addresses the issue in the code I wrote years ago. If anyone who's working on this these days can test it that would be amazing. I haven't tested it, though I am fairly confident in the fix.

Before submitting a Pull Request:

• I reviewed CONTRIBUTING.md
• I built my changes locally
• I ran the unit tests
• I ran the functional tests with a device
• I ran the performance tests with a device

I tested changes on:

• Windows
• Linux