Converting NSPoint to NSPixel doesn't consider scaleFactor

[xhruso00]

There is a difference between point on a screen and pixel coordinate in bitmap.

https://github.com/suobset/blot/blob/8520b064d08552edee02392c13c1b966ad9b889e/Blot/CanvasView.swift#L975

[suobset]

Thanks for bringing this to my attention, I appreciate it a lot!! This is on the radar now :)