Fix for page body widths being incorrect on Stats #2

This is the second version of this ticket that doesn't contain
whitespace fixes.

As noted in the ticket, the widths of the main body of the Stats
and Accounts page were incorrect. On the stats page, the rightmost
column was offscreen; on the Accounts page the text gets cut off.

This ticket fixes the stats page. The Create Admins page still
has the text get cut off. This is unrelated to this issue - I'll
fix that in a separate ticket (COUCHDB-2417).

Closes COUCHDB-2428