test: drop self.machine conditional
test: drop self.machine conditional

self.machine should always be initialized either if through the first if
conditional or in the else as `provision` is always initialized to one
machine. This makes `pyright` and other LSP / linters not warn that
`self.browser` might not be initialized in our tests.

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