Make "classic" style have effect

Hopefully fixes failures in #5416

lib/matplotlib/testing/decorators.py

@@ -138,6 +138,7 @@ def check_freetype_version(ver):
 class ImageComparisonTest(CleanupTest):
     @classmethod
     def setup_class(cls):
+        CleanupTest.setup_class()
         cls._initial_settings = mpl.rcParams.copy()
         try:
             matplotlib.style.use(cls._style)
@@ -146,10 +147,6 @@ def setup_class(cls):
             mpl.rcParams.clear()
             mpl.rcParams.update(cls._initial_settings)
             raise
-        # Because the setup of a CleanupTest might involve
-        # modifying a few rcparams, this setup should come
-        # last prior to running the image test.
-        CleanupTest.setup_class()
         cls.original_settings = cls._initial_settings
         cls._func()