maze: refactor move_to_center

mod_graph/maze.py

@@ -197,10 +197,9 @@ def choose_plural(amount, declensions):
 
 def move_to_center(obj, scene_sz):
     """Перемещает объект к центру"""
-    bounds = bbox(obj)
-    width = bounds[2] - bounds[0]
-    height = bounds[3] - bounds[1]
-    p = scene_sz // 2 - Coords(width, height) // 2
+    x1, y1, x2, y2 = bbox(obj)
+    obj_sz = Coords(x2, y2) - Coords(x1, y1)
+    p = scene_sz // 2 - obj_sz // 2
     moveObjectTo(obj, *p)