Equalize tollerance for all protocols

This way for all different protocolls the tollerance of the pulselength
is +/- 5%

For the current implementation it's: 
+/- 3.8% for impuls (pulselength = 130)
+/- 1.4% for arctec_switch_old (pulse length = 336)

imo even 3.8% is quite strict.