… only take degrees for the angle input

We had it so that locked ellipse settings allow for either degrees or radians
for the angel input. However, I realized that we're not saving the data for
what unit is being used. This means that if an angle were saved as "30 degrees"
and then the page were reloaded, it would then show up as "0.523599 radians".

For the sake of simplicty and consistency, I'm changing this so that it only
takes degrees, and I'm changing it to a number input since it no longer needs
to evaluate expressions with pi (that required it being a text input).

Issue: https://khanacademy.atlassian.net/browse/LEMS-1941

Test plan:
`yarn jest`

Storybook
- http://localhost:6006/?path=/story/perseuseditor-editorpage--mafs-with-locked-figures-m-2-flag
- Confirm that the ellipse settings angle input shows degrees only
- Confirm that it is rotated correctly

…ll locked figures

Super minor. Just adding a locked vector to the `segmentWithLockedFigures`
testdata so that the stories with all locked figures show all the current
locked figures.

Issue: none

Test plan:
http://localhost:6006/?path=/story/perseuseditor-editorpage--mafs-with-locked-figures-m-2-flag

confirm all four locked figure types' settings are there