Can't scan screen with face sensing enabled

[slyi]

1. Go to project https://turbowarp.org/1227955398

Expected:
draw your mouth in top left corner on scratch
Actual:
Cant scan screen when face sencing enabled on turbowarp .

[GarboMuffin]

This is works as intended right now, since face sensing is a "custom" extension we disable color sensing on the webcam layer to prevent sending the webcam image externally

Perhaps we could add a flag for extensions to mark themselves as not offering external communication methods, then we could fix this

[slyi]

Ah that's make sense, scratch just blocks cloud variables when camera is used.