Fix draw icon in the simulator #1453
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jwunderl
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jwunderl
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Fixes microsoft/pxt-arcade#5994
The issue is that when drawing started at a negative y position, we were adjusting the start index from the icon so that we were only reading the pixels that actually appear on screen. However, we weren't adjusting the destination index in the image we were drawing to which resulted in everything being shifted up a few pixels.
I also renamed all of the variables to make it easier to read. The only actual change is line 563