Fix script/clean on systems where `find` requires a path argument

Signed-off-by: Aanand Prasad <[email protected]>

script/clean

@@ -3,5 +3,5 @@ set -e
 
 find . -type f -name '*.pyc' -delete
 find . -name .coverage.* -delete
-find -name __pycache__ -delete
+find . -name __pycache__ -delete
 rm -rf docs/_site build dist docker-compose.egg-info