Hotfix make shape max sizes larger

Based on customer requests, this is an improvement that changes the maximum markup shape sizes to be about as large as the image.

QA steps:
1. `git co master && git pull`
2. `cd 3P/node-markup`
3. `git co hotfix-make-shape-max-sizes-larger`
4. Go to an image markup module
5. Add a circle or rectangle
6. Test maximum sizes