Restore the slash-prefixed paths in the malformed_paths test.

Author: jaraco

Lib/test/test_zipfile.py

@@ -3661,6 +3661,8 @@ def test_malformed_paths(self):
         """
         data = io.BytesIO()
         zf = zipfile.ZipFile(data, "w")
+        zf.writestr("/one-slash.txt", b"content")
+        zf.writestr("//two-slash.txt", b"content")
         zf.writestr("../parent.txt", b"content")
         zf.filename = ''
         root = zipfile.Path(zf)