Fix repeated kwarg issue in setup.py
Fix repeated kwarg issue in setup.py

`requires` was already set in the call, causing issues when
trying to install that plugin.

Setting `plugin_requires` in the configuration section of 
`setup.py` instead and removing the second `requires`
parameter fixes that.
BillyBlaze/OctoPrint-TouchUI,BillyBlaze/OctoPrint-TouchUI,BillyBlaze/OctoPrint-TouchUI