[MRTK3] Hand interactor colliders block 2D mouse input

[Zee2]

Describe the bug

Hand interactor colliders can block the screenspace 2D mouse input, even when the hand is not currently "up".

To reproduce

Place hands in front of view. Regardless of whether the hand is active or not, the colliders on the hand can and will still block 2D mouse input.

Expected behavior

2D mouse input shouldn't hit the interactor colliders.