Fix Animated Path2D doesn't update PathFollow2D progress when scene is running.

[ditiem-games]

PathFollow2D needs to update its transform whenever a curve changes (for instance a point change its position).

I have tested with the project provided in https://github.com/godotengine/godot/issues/85813 bugsquad edit: Fixes #85813.

I have noticed useless code in curve.cpp around call to _bake function:

	if (baked_cache_dirty) {
		_bake();
	}

and the _bake functions is like:

void Curve2D::_bake() const {
	if (!baked_cache_dirty) {
		return;
	}

My eyes bleed but I did not touch it for easy merge :)