XSLTUnicodeSort shouldn't use bloatedCharacters (part 2)

Looks like I missed another instance of this pattern in this file.

TBR=eseidel
BUG=254708

Review URL: https://chromiumcodereview.appspot.com/18493007

git-svn-id: svn://svn.chromium.org/blink/trunk@154099 bbb929c8-8fbe-4397-9dbb-9b2b20218538