Fix bug with timeout counting

[aklajnert]

No description provided.

[codecov-commenter]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
138	1	137	4

View the top 1 failed tests by shortest run time

tests/test_subprocess.py::::test_multiple_wait[True]

Stack Traces | 0.602s run time

fp = <pytest_subprocess.fake_process.FakeProcess object at 0x7f2129002f20>
fake = True

    @pytest.mark.flaky(reruns=2, condition=platform.python_implementation() == "PyPy")
    @pytest.mark.parametrize("fake", [False, True])
    def test_multiple_wait(fp, fake):
        """
        Wait multiple times for 0.2 seconds with process lasting for 0.7.
        Third wait shall be a bit longer and will not raise an exception,
        due to exceeding the subprocess runtime.
        """
        fp.allow_unregistered(not fake)
        if fake:
            fp.register(
                [PYTHON, "example_script.py", "wait"],
                wait=0.7,
            )
    
        process = subprocess.Popen(
            (PYTHON, "example_script.py", "wait"),
        )
        with pytest.raises(subprocess.TimeoutExpired):
            process.wait(timeout=0.2)
    
        with pytest.raises(subprocess.TimeoutExpired):
            process.wait(timeout=0.2)
    
        process.wait(0.6)
    
        assert process.returncode == 0
    
        # one more wait shall do no harm
>       process.wait(0.2)

.../pytest-subprocess/tests/test_subprocess.py:510: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <pytest_subprocess.fake_popen.FakePopen object at 0x7f2129001f60>
timeout = 0.2

    def wait(self, timeout: Optional[float] = None) -> int:
        if timeout and self._wait_timeout and timeout < self._wait_timeout:
            self._wait_timeout -= timeout
>           raise subprocess.TimeoutExpired(self.args, timeout)
E           subprocess.TimeoutExpired: Command '('.../pytest-subprocess/pytest-subprocess/.nox.../tests-3-10/bin/python', 'example_script.py', 'wait')' timed out after 0.2 seconds

.../pytest-subprocess/pytest-subprocess/.nox.../tests-3-10/lib/python3.10.../site-packages/pytest_subprocess/fake_popen.py:146: TimeoutExpired

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