Exit command mode in editor tests

Similarly to 24d01ad25729458f0584a35c6b4d9a36f0b5e580, failing Qt 5.15 tests
showed some evidence of us being stuck in command mode in the next test file
(hints.feature). On the first test there ("Scenario: Using :hint-follow outside
of hint mode (issue 1105)"):

    17:38:51.073 ERROR    message    message:error:63 hint-follow: This command
    is only allowed in hint mode, not command.

but:

    end2end.fixtures.testprocess.WaitForTimeout: Timed out after 15000ms waiting
    for {'category': 'message', 'loglevel': 40, 'message': 'hint-follow: This
    command is only allowed in hint mode, not normal.'}.

I agree with what has been said: This should never happen, because we restart
the qutebrowser process between test files. I did some of the mentioned "more
examination" but also don't have an explanation.

To avoid more flaky tests, let's roll with another bandaid solution.

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