reverted changes to tox.ini to handle this in separate pr

Author: felix314159

tox.ini

@@ -21,7 +21,7 @@ description = Lint and code formatting checks (ruff)
 extras = lint
 commands =
     ruff check --no-fix --show-fixes {[testenv]python_source_dirs}
-    ruff format --check {[testenv]python_source_dirs} # use check instead of diff to avoid red print of 'x files already formatted'
+    ruff format --diff {[testenv]python_source_dirs}
 
 [testenv:typecheck]
 description = Run type checking (mypy)