Update ir_Aiwa.cpp
Update ir_Aiwa.cpp

Remove unused mask variable line 31
ivankravets/Arduino-IRremote,Seeed-Studio/IRSendRev,shirriff/Arduino-IRremote,shirriff/Arduino-IRremote,YodaR10/Arduino-IRremote,z3t0/Arduino-IRremote,AnalysIR/Arduino-IRremote,Seeed-Studio/IRSendRev,YodaR10/Arduino-IRremote,ivankravets/Arduino-IRremote,z3t0/Arduino-IRremote,MadGarra/Arduino-IRremote,Informatic/Arduino-IRremote,AnalysIR/Arduino-IRremote,Informatic/Arduino-IRremote,MadGarra/Arduino-IRremote