bug#37452: 26.3; skip-syntax-forward doesn't work in python-mode

[Amai Kinono <amaikinono@gmail.com>]

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Here's how to reproduce:

- Run `emacs -Q`

- Define a command like this and eval it

  ``` emacs-lisp
  (defun skip-syntax ()
    (interactive)
    (skip-syntax-forward (char-to-string (char-syntax (char-after)))))
  ```

  It gets the syntax of the next char and skip chars with the same syntax.

- M-x python-mode, clear the buffer, type

  ``` python
  print(|'hello')
  ```

  `|` stands for the cursor position.

- Call skip-syntax. The expected behavior is:

  ``` python
  print('|hello')
  ```

  but actually the cursor doesn't move.


I've tried some other modes, and the above command can skip the
quotation mark normally, so this should be a problem of Python mode.

In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.10)
 of 2019-08-30 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12005000
System Description: Manjaro Linux

Recent messages:
uncompressing python.el.gz...
uncompressing python.el.gz...done
Note: file is write protected
Quit [2 times]
M-SPC r is undefined

Configured using:
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