Fix config generation on Python 3.14

[halfcity789]

Description

Fix an issue that prevents jwt_tool from generating its initial
configuration file when running with Python 3.14.

Problem

createConfig() uses ConfigParser(allow_no_value=True) and stores
comment-like strings as no-value option names in order to preserve
comments in the generated jwtconf.ini.

Python 3.14's configparser performs stricter validation when writing
configuration files and raises InvalidWriteError when these option
names contain delimiters such as :.

This causes the initial configuration setup to fail with:

configparser.InvalidWriteError:
Cannot write key # To disable the proxy option set this value to: False (no quotes). For Docker installations with a Windows host OS set this to: "host.docker.internal:8080"; contains delimiter :

As a result, an incomplete jwtconf.ini may be left behind, causing
subsequent executions to fail with errors such as:

KeyError: 'argvals'

Testing

Tested with Python 3.14.6.

Verified that jwt_tool can successfully generate jwtconf.ini

This change preserves the existing configuration generation approach
while avoiding the invalid option-name delimiter.