Fix invisible character typo (python#123933)

Remove accidental addition of zero-width character (U+FEFF) reported by @jaraco:
- python@c3f4a6b#commitcomment-146456562

Author: xyb

Lib/zipfile/_path/__init__.py

@@ -280,7 +280,7 @@ class Path:
     >>> str(path.parent)
     'mem'
 
-    If the zipfile has no filename, such attributes are not
+    If the zipfile has no filename, such attributes are not
     valid and accessing them will raise an Exception.
 
     >>> zf.filename = None