Update DnsLayer.cpp
Update DnsLayer.cpp

Change numOfOtherResources's type from uint16_t to uint32_t . Solved the bug of DNS resources number more than 65535 and less than 65835.
seladb/PcapPlusPlus,seladb/PcapPlusPlus,seladb/PcapPlusPlus,seladb/PcapPlusPlus