Fix special case at Special:MediaStatistics

When a percentage was equal to 100 %, makePercentPretty
determined it should have zero decimal places, and the
resulting string "100" had "trailing 0's" removed, resulting
in a completely wrong "1".

We might either check if the number contains the decimal dot
prior to trimming, or spare the hassle for the special case
completely.

Change-Id: I15ac5caa275d72909adba27b6b88824a830bd574
Merge "Fix special case at Special:MediaStatistics"