[clang-format][NFC] Reformat clang/test/Format/lit.local.cfg with black

clang/test/Format/lit.local.cfg

@@ -21,7 +21,7 @@ config.suffixes = [
     ".textpb",
     ".asciipb",
     ".td",
-    ".test"
+    ".test",
 ]
 
 # AIX 'diff' command doesn't support --strip-trailing-cr, but the internal
@@ -31,5 +31,5 @@ if platform.system() == "AIX":
 
 # Create an empty .clang-format-ignore file so that tests don't get messed
 # up if one exists higher in the tree
-with open(".clang-format-ignore", 'w'):
+with open(".clang-format-ignore", "w"):
     pass