intersect_point ignores collision_layer argument

[IvanSoldano]

Godot version:

3.2.3 RC 1 win64

OS/device including version
Windows 10

Issue description:

Physics2DDirectSpaceState.intersect_point ignores the collision_layer argument and returns any intersecting area or body regardless of the layer it is on. Works fine in version 3.2.2 Stable win64

Steps to reproduce:
Use the reproduction project to check for collisions with the mouse pointer, notice how intersect_ray works correctly compared to intersect_point

Minimal reproduction project:

IntersectPointCollisionLayerIgnored.zip

[madmiraal]

#40193 deliberately removed the collision layer checking, because it was thought that:

_intersect_point_impl() isn't used for anything else than mouse picking, so making it ignore layers is safe.

Of course _intersect_point_impl() is also used by PhysicsDirectSpaceState's intersect_point() function, hence this issue.

My suggestion is to revert #40193 and its 3.2 counterpart #40280 and find an alternative solution for #11159.