Gaps between buttons in pause menu no longer of equal size

The bug

Up until 1.13.2, the horizontal and vertical gaps between buttons that are close to each other were of the same size. Since 18w43a, this has no longer been the case, and the middle rows of buttons have a larger horizontal gap than a vertical gap.

How to fix

Make the buttons slightly wider such that they are closer together, closing the gap slightly so that the gap is the same size as the vertical gap.