we do need to quote when adding media

contrary to commit 3576475, we do need to quote when adding media on windows
as well, as it seems webkit can not handle all representations variants when
passed unicode

as we're stripping # and % when adding characters, hopefully that's the last
of it!

aqt/editor.py

@@ -866,8 +866,7 @@ to a cloze type first, via Edit>Change Note Type."""))
                     pass
         # return a local html link
         ext = name.split(".")[-1].lower()
-        if not isWin and not isMac:
-            name = urllib.quote(name.encode("utf8"))
+        name = urllib.quote(name.encode("utf8"))
         if ext in pics:
             return '<img src="%s">' % name
         else: