[bug] ExUnit: restarting logger with capture_log: true stops current test execution without errors

[Daniel Kukuła]

I recently found a bug that shows up when you have capture_log enabled and your code uses Logger.App.stop()/start(). Having capture_log: true makes this test show up green.
```
  @tag capture_log: true
  test "greets the world" do
    Logger.App.stop()
    Logger.App.start()
    assert :hello == :world
  end
```
Minimal example repo here with capture_log set in ExUnit.start(capture_log: true)
https://github.com/dkuku/logger_error

[José Valim]

Thank you, fixed in main.

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