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

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

• create a Ponder Question
• create an Answer
• look at the Comments input field that now should be more nicely indented
• the normal Response field is not changed at all
• the mobile view is not changed at all
• click on "Pin Form On Screen" and it must be as before