Fix property type of Sprite3D frame_coords to Vector2i from Vector2

[TokageItLab]

• Fixes Sprite3D Frame Coords bug #93810

The setter and getter types are correct, and there is probably no problem with compatibility since the only change is the type hint when binding.

[Mickeon]

The class reference file needs to also be changed (concerningly, none of the tests picked up on this)

[TokageItLab]

@Mickeon Presumably, the class reference is generated by reference to the getter type and does not need to be fixed.

Both getters and setters had their type as Vector2i, but only PropertyInfo was incorrectly registered as Vector2, this PR fixes it.

[Mickeon]

I'm fine with this personally. It breaks compatibility, sure, but it does as much as a bugfix would. Unsure it should be in 4.3, though.

[raulsntos]

This doesn't break compat in C# because the generated bindings use the type of the getter/setter as the property type. So the C# property was already using the Vector2i type.

So regarding C# compat this change is fine 👍

[Mickeon]

That is actually shockingly fantastic, I think this is fine for 4.3 then

[akien-mga]

Thanks!