Fix wrong collision box scaling of physics props

[wjxggg]

For example:

Create a prop_physics entity with SetModelScale(2) then Activate()

Before the fix:

After the fix:

What is wrong:
SetCollisionBounds doesn't require scale information
It reads the scaling information directly from GetModelScale
Which is SetModelScale will do

[wjxggg]

CBaseAnimating::TestHitboxes always returns true, whether the ray hits or not
This has not yet caused problems
But compared to other similar functions, this is confusing
So I made it to return true if the ray hit, and false if not

[wjxggg]

And there is a mismatch issue on client side when a prop is scaled
I'm still working on this