Fix NTPServers property in Redfish

Recent changes to phosphor-network have changed the NTPServers property
to be actually StaticNTPServers.  This makes PATCH incorrect.

Tested: Redfish-protocol-validator passes the NTPServers property again.

```
curl -vvvv --insecure --user root:0penBmc https://192.168.7.2/redfish/v1/Managers/bmc/NetworkProtocol -X PATCH -d '{"NTP": {"NTPServers": ["time-a-b.nist.gov", "time-b-b.nist.gov"]}}'
```

Now succeeds.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ie4bcfa6190797dd250421d1a512677841a4319e4
diff --git a/redfish-core/lib/network_protocol.hpp b/redfish-core/lib/network_protocol.hpp
index 5c473a6..c3165ee 100644
--- a/redfish-core/lib/network_protocol.hpp
+++ b/redfish-core/lib/network_protocol.hpp
@@ -60,7 +60,7 @@
 
             for (const auto& propertyPair : ifacePair.second)
             {
-                if (propertyPair.first == "NTPServers")
+                if (propertyPair.first == "StaticNTPServers")
                 {
                     const std::vector<std::string>* ntpServers =
                         std::get_if<std::vector<std::string>>(
@@ -352,7 +352,7 @@
                         }
                         },
                         service, objectPath, "org.freedesktop.DBus.Properties",
-                        "Set", interface, "NTPServers",
+                        "Set", interface, "StaticNTPServers",
                         dbus::utility::DbusVariantType{currentNtpServers});
                 }
             }