serial: fixed default rate for bad baud rate
serial: fixed default rate for bad baud rate

thanks to joeman155 for noticing this!

mikeclement/SiK,Dronecode/SiK,Serveurperso/SiK,LorenzMeier/SiK,Dronecode/SiK,tomszilagyi/SiK,LorenzMeier/SiK,Serveurperso/SiK,phelpsw/SiK,LorenzMeier/SiK,davidbuzz/SiK,tomszilagyi/SiK,tomszilagyi/SiK,phelpsw/SiK,weera00/SiK,phelpsw/SiK,RFDesign/SiK,mikeclement/SiK,mikeclement/SiK,LorenzMeier/SiK,Serveurperso/SiK,RFDesign/SiK,tomszilagyi/SiK,weera00/SiK,tomszilagyi/SiK,tridge/SiK,Dronecode/SiK,davidbuzz/SiK,weera00/SiK,RFDesign/SiK,RFDesign/SiK,weera00/SiK,Dronecode/SiK,nusepo/SiK,nusepo/SiK,tridge/SiK,phelpsw/SiK,weera00/SiK,davidbuzz/SiK,phelpsw/SiK,mikeclement/SiK,mikeclement/SiK,tridge/SiK,RFDesign/SiK,davidbuzz/SiK,tridge/SiK,Serveurperso/SiK,davidbuzz/SiK,nusepo/SiK,nusepo/SiK,tridge/SiK,nusepo/SiK