R1:0dfc84e2abef

Ponder Answer Comments: indent textarea as Comments

Summary:
In a Ponder Answer, when adding a Comment, the textarea indentation was a
a little bit unintuitive.

After this change, the textarea is aligned as a Comment:

| Before | After |
|-----------|-----------|
| {F286220} | {F286221} |

Other changes are welcome but this seems to me a good minimum.

I also hope this could help not to confuse the Comment field with the Answer field.

Closes T15350

Test Plan:
- create a Ponder Question
- create…