test: Adjust expected Fedora documentation name for fedora-testing
test: Adjust expected Fedora documentation name for fedora-testing

Our fedora-testing image is moving to Fedora 35. Adjust
TestPages.testBasic for the changed name. Invert the condition to do the
right thing for future Fedora versions.

mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit