Fix incorrect name of internal Basis global scale getter

[aaronfranke]

I was looking at the Basis scale methods to double-check that my review of #90584 was correct and I noticed a problem. Basis currently has an internal-only (not exposed) method called get_scale_local that gets the global scale.

Fortunately the fix is very simple: Rename the method. The 3 places using the method are already correct, they are expecting the global scale as they pass it into scale which is global (we could rename this too, although it might be confusing because scaled with a "d" is exposed and is also global).

Proof: Here is what happens if I expose the method and call it from GDScript:

extends Node


func _ready() -> void:
	var rot_90_xy = Basis(Vector3.UP, Vector3.LEFT, Vector3.BACK)
	var b = rot_90_xy * Basis.from_scale(Vector3(1, 2, 3))
	print(b.get_scale()) # Prints (1, 2, 3) the local scale
	print(b.get_scale_local()) # Prints (2, 1, 3) the global scale, so let's rename to `get_scale_global`

By the way, if you are wondering whether from_scale is global or local, it's actually both. The difference is that other * from_scale will perform a local scale, while from_scale * other will perform a global scale.

[AThousandShips]

Makes sense, though I think we could use a more clear naming perhaps, depending on assumptions of it, maybe something like get_scale_transposed

[akien-mga]

Thanks!