Tests: fix incorrect check for hidden dir

Copy-pasted mistake in tests and tools.

tests/python/bl_run_operators.py

@@ -100,10 +100,8 @@ def blend_list(mainpath):
 
     def file_list(path, filename_check=None):
         for dirpath, dirnames, filenames in os.walk(path):
-
-            # skip '.svn'
-            if dirpath.startswith("."):
-                continue
+            # skip '.git'
+            dirnames[:] = [d for d in dirnames if not d.startswith(".")]
 
             for filename in filenames:
                 filepath = join(dirpath, filename)