Sort imports

Using pytest's style.

src/xdist/__init__.py

@@ -1,10 +1,9 @@
-from xdist.plugin import (
-    is_xdist_worker,
-    is_xdist_master,
-    get_xdist_worker_id,
-    is_xdist_controller,
-)
 from xdist._version import version as __version__
+from xdist.plugin import get_xdist_worker_id
+from xdist.plugin import is_xdist_controller
+from xdist.plugin import is_xdist_master
+from xdist.plugin import is_xdist_worker
+
 
 __all__ = [
     "__version__",