getTorbuttonUserAgent differs from browser user-agent

In Tails 0.22 getTorbuttonUserAgent returns:

Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0

While Tails browser returns:

Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Firefox/24.0

Those two values should be the same.

Feature Branch: bugfix/6477-htpdate-user-agent

Original created by @sajolida on 6477 (Redmine)

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