fix crash in tpo.py
It seems like the TPOSites class expects a config member dict here. I'm not sure what it's for, but this patch fixes the following crash:
root@hetzner-nbg1-02:~# /usr/share/onionprobe/examples/tpo.py
Traceback (most recent call last):
File "/usr/share/onionprobe/examples/tpo.py", line 161, in <module>
instance.build_onionprobe_config()
File "/usr/share/onionprobe/examples/tpo.py", line 132, in build_onionprobe_config
self.config['shuffle'] = False
AttributeError: 'TPOSites' object has no attribute 'config'
Closes: #42 (closed)