Error in internal utility function to invert scaling

[processing-bot]

Created by: codeanticode

The function invScale() for 2D matrices is implemented incorrectly, with the 1/y term in the wrong place:

https://github.com/processing/processing4/blob/master/core/src/processing/opengl/PGraphicsOpenGL.java#L3876

[processing-bot]

Created by: codeanticode

Fixed with commit 6a1c8bc, part of this PR.

[processing-bot]

Created by: benfry

Now merged for 4.0 beta 4.

[processing-bot]

Created by: github-actions[bot]

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