Fix setting spatial sound option to false

[docEdub]

When sounds have the spatialSound option set to true, setting it to false does not disable spatial sound. This change fixes the issue. This change also gets setting the spatialSound option working when using the Sound.updateOptions function.

Reported on forum: https://forum.babylonjs.com/t/what-is-the-expected-behavior-when-i-detach-sound-from-a-mesh/42315

Tested on Chrome browser with playground https://playground.babylonjs.com/#2AH4YH#81.

[bjsplat]

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[bjsplat]

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