Add print styles reset for Windows Safari

Windows Safari as identified by this user agent string:

Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.57.2 (KHTML, like Gecko)
Version/5.1.7 Safari/534.57.2
Remove semi-colon from Platform Token
Merge pull request #176 from alphagov/fix-safari-print-bug

Fix safari print bug