Simulator: Accelerometer negative values do not go to -1023 when simulating external hardware

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Describe the bug Using accelerometer 'x' axis values in a Program. If you roll over the simulator, you get a maximum value of 1023 on the right of the simulator but only ~-831 on the left.

https://user-images.githubusercontent.com/31242877/123605566-e2fa2080-d7f3-11eb-839e-db53e6692cd7.mp4

To Reproduce Steps to reproduce the behavior:

1. Use acceleromater in MakeCode Program
2. Roll over simulator

Expected behavior I would expect values to range between -1023 to 1023 on the simulator.

Desktop (please complete the following information):

• OS: [e.g. iOS] Windows 10
• Browser [e.g. chrome, safari] Edge
• Version [e.g. 22] 91

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In full screen mode you get a full 1023 value, wherever you hold the cursor.

Moving the cursor off the micro:bit reduces the value back to 0

Reproduces in Chrome and Edge

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https://support.microbit.org/a/tickets/46830

I think this is a report of the same issue... It's even more confusing for people when you use tilt left. It's almost impossible to trigger a tilt left on the simulator.

@abchatra this seems to only reproduce when the simulator is extended eg sound/servo