Examples: fix network-chat in the presence of an IPv6 stack

Since we bind to QHostAddress::Any, the incoming packets are actually
IPv4-mapped IPv6 addresses and the operator== strict comparison was
failing. Instead, use isEqual(), which defaults to TolerantComparison.

Change-Id: Ic38ec929fc3f4bb795dafffd150ac6b3a0a7e3b2
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

examples/network/network-chat/peermanager.cpp

@@ -108,7 +108,7 @@ void PeerManager::startBroadcasting()
 bool PeerManager::isLocalHostAddress(const QHostAddress &address)
 {
     foreach (QHostAddress localAddress, ipAddresses) {
-        if (address == localAddress)
+        if (address.isEqual(localAddress))
             return true;
     }
     return false;