commander: negate main_state_rc entering condition
commander: negate main_state_rc entering condition

pure refactor using De Morgan's law to make the condition more intuitive
since you think about when should I enter and not when should I skip

dagar/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,dagar/Firmware,PX4/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,acfloria/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,acfloria/Firmware,krbeverx/Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware