Fix mouse coord mismatch in `AceEditor` on zoom out

ReactFlow's internal zooming function breaks the way `AceEditor` keeps track of cursor/mouse position.
To fix, one needs to project the mouse event coordinates into the current zoom level:
https://github.com/wbkd/react-flow/discussions/2977

This isn't a high priority issue because it can be fixed by just zooming back into 1x.
But, it is something that will likely come up again in other node types.