network/hostname: Mark as a "service"-type.

It is technically the "reverse" of DNS settings, which are also
classified as a "service", so they should go together.

src/add-ons/network_settings/hostname/HostnameAddOn.cpp

@@ -80,7 +80,7 @@ HostnameItem::~HostnameItem()
 BNetworkSettingsType
 HostnameItem::Type() const
 {
-	return B_NETWORK_SETTINGS_TYPE_OTHER;
+	return B_NETWORK_SETTINGS_TYPE_SERVICE;
 }