Graphics Boxes in "Vectors Demo" microworld are too small in build 3.4.18 2024-05-26

[rigdern]

Repro steps

I reproed this with Boxer 3.4.18 2024-05-26 on macOS

1. Open the "Vectors Demo" microword file.
2. In Boxer, click the microwold's box to navigate into it.
3. Click the "Apollo Missions - Flight to the Moon" box to navigate into it.

Unexpected result: The graphics boxes are too small such that they look empty — their graphics are not visible. Specifically:

• Main graphics box. You should see a spaceship in this box but instead you see nothing.
• vel & acc boxes. You should see a dot in each of these (represents a zero vector) but instead you see nothing.

Expected result. Here's how these 3 graphics boxes should look (screenshot from Boxer 3.4.16 2024-02-26):

Impact

This impacts the "Vectors Demo" microworld.

[sgithens]

As hypothesized in #80, the same commit, 289f5cee443585cfb4a3b7047a631fdfa1af5e7c, has also fixed this issue.