DeviceInputSystem: Use correct pointerId for touch inputs on blur and pointercancel event

[PolygonalSun]

A forum user recently found an issue where the pointerId was incorrect for blur and pointercancel events fired from a touch input. This PR adds a small change to the DeviceEventFactory to use the pointerId, if available.

Forum Link: https://forum.babylonjs.com/t/distinguish-between-onbuttonup-events-in-basecamerapointersinput/37985/1

[bjsplat]

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[bjsplat]

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