Guide print stylesheet: from gov.uk text duplicated

This fixes this issue:
https://govuk.zendesk.com/agent/#/tickets/764799
When printing out a guide, the title is followed by "a guide from GOV.UK from GOV.UK"
This change fixes that duplication. 
I will be opening a new pivotal ticket to track the issue that "from GOV.UK" is being added to the print copy even for Welsh print-outs: this is a less straightforward change as it ties in to another discussion on locales on HTML pages.