pwm_out_sim: cleanup, avoid unnecessary & incorrect init of _control_subs
pwm_out_sim: cleanup, avoid unnecessary & incorrect init of _control_subs

These need to be set to -1.

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