Adjust top dir arg

pyproject.toml

@@ -11,7 +11,7 @@ manylinux-x86_64-image = "manylinux2014"
 manylinux-i686-image = "manylinux2014"
 skip = "pp* cp36-* *musllinux*"
 test-skip = "cp310-win32 cp310-manylinux_i686"
-test-command = "stestr --config {project}/.stestr.conf --top-dir {project}/test -t {project}/test/python run"
+test-command = "stestr --config {project}/.stestr.conf --top-dir {project} -t {project}/test/python run"
 # We need to use pre-built versions of Numpy and Scipy in the tests; they have a
 # tendency to crash if they're installed from source by `pip install`, and since
 # Numpy 1.22 there are no i686 wheels, so we force pip to use older ones without