Move tooltips further right

Summary:
Acceptable format tooltips were hanging off the edge of the page when an
input-number was on the left side of the question area. This change
moves the tooltip to the right (making it left-aligned with the
left-side of the input, rather than right-aligned) so that this
situation won't occur. This might make the tooltip hang off the page to
the right in some questions, but this situation should be much less
common.

Test Plan:
 * Made an input number
 * Set its type to "numbers or percents"
 * saw that the tooltip goes to the left of the question area
 * permalinked
 * made this change
 * reloaded and saw that the tooltip doesn't go past the left side of
   the quetsion area

Auditors: charlie