Future-proof the test suite vs future fundraising campaign headers

Originally created by @intrigeri on #14935 (Redmine)

“The persistent Tor Browser directory is usable” scenario is broken by the fundraising campaign header:

FindFailed: can not find TorBrowserSavedStartupPage.png in S(0)[0,0 1024x768]

I think this header depends on JS to work nicely, which we don’t have on file:/// pages.

How about we look for the “Tor check” button instead?

Feature Branch: test/14935-dogtailify-tor-browser

Edited May 21, 2020 by intrigeri

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