[Redfish] Fixed PATCH behavior of IndicatorLED in ComputerSystem

Patching IndicatorLED to "Lit" was not working. Also modified the
response code to 204 no-content for successful PATCH request.

Tested:
PATCH /redfish/v1/Systems/system HTTP/1.1
{
    "IndicatorLED": "Lit"
}
Response:
 204 No Content

GET /redfish/v1/Systems/system HTTP/1.1
Response:
{
    "@odata.context": "/redfish/v1/$metadata#ComputerSystem.ComputerSystem",
    "@odata.id": "/redfish/v1/Systems/system",
    "@odata.type": "#ComputerSystem.v1_6_0.ComputerSystem",
    "Actions": {
        "#ComputerSystem.Reset": {
            "ResetType@Redfish.AllowableValues": [
                "On",
                "ForceOff",
                "GracefulRestart",
                "GracefulShutdown"
            ],
            "target": "/redfish/v1/Systems/system/Actions/ComputerSystem.Reset"
        }
    },
    "Boot": {
        "BootSourceOverrideEnabled": "Disabled",
        "BootSourceOverrideMode": "Legacy",
        "BootSourceOverrideTarget": "None",
        "BootSourceOverrideTarget@Redfish.AllowableValues": [
            "None",
            "Pxe",
            "Hdd",
            "Cd",
            "Diags",
            "BiosSetup"
        ]
    },
    "Description": "Computer System",
    "Id": "system",
    "IndicatorLED": "Lit",
    "LogServices": {
        "@odata.id": "/redfish/v1/Systems/system/LogServices"
    },
    "Memory": {
        "@odata.id": "/redfish/v1/Systems/system/Memory"
    },
    "MemorySummary": {
        "Status": {
            "State": "Disabled"
        },
        "TotalSystemMemoryGiB": 0
    },
    "Name": "Computer System",
    "PowerState": "On",
    "ProcessorSummary": {
        "Count": 4,
        "Model": "Intel Xeon processor",
        "Status": {
            "State": "Enabled"
        }
    },
    "Processors": {
        "@odata.id": "/redfish/v1/Systems/system/Processors"
    },
    "Status": {
        "State": "Enabled"
    },
    "SystemType": "Physical",
    "UUID": "13876882-7708-4200-bcf2-2c5681218bc8"
}

Signed-off-by: Jennifer Lee <jennifer1.lee@intel.com>
Change-Id: I8ae152190ee9f122e8580903a9d5e687b2fd9e13
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index a76f2c4..70e9dac 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -1189,7 +1189,7 @@
         }
 
         auto asyncResp = std::make_shared<AsyncResp>(res);
-        messages::success(asyncResp->res);
+        asyncResp->res.result(boost::beast::http::status::no_content);
 
         if (bootProps)
         {
@@ -1208,9 +1208,9 @@
         if (indicatorLed)
         {
             std::string dbusLedState;
-            if (*indicatorLed == "On")
+            if (*indicatorLed == "Lit")
             {
-                dbusLedState = "xyz.openbmc_project.Led.Physical.Action.Lit";
+                dbusLedState = "xyz.openbmc_project.Led.Physical.Action.On";
             }
             else if (*indicatorLed == "Blinking")
             {
@@ -1227,9 +1227,6 @@
                 return;
             }
 
-            getHostState(asyncResp);
-            getComputerSystem(asyncResp);
-
             // Update led group
             BMCWEB_LOG_DEBUG << "Update led group.";
             crow::connections::systemBus->async_method_call(