Fix hotword override
Fix hotword override

==== Tech Notes ====
The threshold of the hotword was overritten with None since no default
threshold is in the default configuration

Dark5ide/mycroft-core,MycroftAI/mycroft-core,linuxipho/mycroft-core,forslund/mycroft-core,linuxipho/mycroft-core,MycroftAI/mycroft-core,Dark5ide/mycroft-core,aatchison/mycroft-core,forslund/mycroft-core,aatchison/mycroft-core