Change set_head_unit_name to mazda to get mazda icon for exit button (#176)

Author: morpheus133

hu/hu_aap.cpp

@@ -397,7 +397,7 @@
       logd ("Service Discovery Request: %s", request.phone_name().c_str());                               // S 0 CTR b src: HU  lft:   113  msg_type:     6 Service Discovery Response    S 0 CTR b 00000000 0a 08 08 01 12 04 0a 02 08 0b 0a 13 08 02 1a 0f
 
     HU::ServiceDiscoveryResponse carInfo;
-    carInfo.set_head_unit_name("Mazda Connect");
+    carInfo.set_head_unit_name("mazda");
     carInfo.set_car_model("Mazda");
     carInfo.set_car_year("2016");
     carInfo.set_car_serial("0001");