fix: does not add fixture when it's a doctest [APE-1236] (#1569)

* fix: does not add  fixture when it's a doctest

* fix: does not add  fixture when it's a doctest

* Update src/ape/pytest/runners.py

---------

Co-authored-by: El De-dog-lo <3859395+fubuloubu@users.noreply.github.com>

src/ape/pytest/runners.py

@@ -133,8 +133,8 @@ def pytest_runtest_setup(self, item):
         """
         if (
             self.config_wrapper.isolation is False
-            or "_function_isolation" in item.fixturenames  # prevent double injection
             or isinstance(item, pytest.DoctestItem)  # doctests don't have fixturenames
+            or "_function_isolation" in item.fixturenames  # prevent double injection
         ):
             # isolation is disabled via cmdline option
             return