Fix bug in tooltips for the icons that represent diff change summaries.
Review Request #8030 — Created March 4, 2016 and submitted
Tooltips were added for the icons in the diff viewer beside each modified file in ceb2b88. During the code review at https://reviews.reviewboard.org/r/7880/ it was discussed that %d could not be used for as a format specifier as only %s is supported. But somehow, in the final revision all the existing instances of %s were swapped out for %d. This change restores the correct %s specifier.
Tested both before and after change. Screenshots show incorrect initial behavior, and desired behavior after change.