Make grid bigger again to reproduce bug on Windows

Author: Splines

tests/fixtures/laggy.py

@@ -6,7 +6,7 @@ class Laggy(Scene):
 
     def construct(self):
         ## Create some boxes
-        grid = Square().get_grid(8, 8, buff=0)
+        grid = Square().get_grid(16, 16, buff=0)
         grid.set_height(5)
         grid.set_stroke(WHITE)
         self.play(ShowCreation(grid))