Improve style in many demos (#1263)

3d/physics_tests/utils/control3d.gd

@@ -1,10 +1,12 @@
 extends Control
 
+
 @export var world_offset := Vector3.ZERO
 
 var _pos_offset: Vector2
 var _attachment: Node3D
 
+
 func _ready() -> void:
 	_pos_offset = position
 	_attachment = get_parent()