Manufacturer data is captured then removed when scanning

[RomaniukRobert]

Hello. I have discovered that while scanning first manufacturer data is parsed and stored in the map PeripheralBase::manufacturer_data_ but then in update_advertising_data it is ovewritten with empty data. I suggest to apply fix:

void PeripheralBase::update_advertising_data(advertising_data_t advertising_data) {
.....
manufacturer_data_.insert(advertising_data.manufacturer_data.begin(), advertising_data.manufacturer_data.end());
...
}
it helped in my case

[KlemenDEV]

Could this be related? #267