Fix misleading error logs for empty/failed JSON-RPC responses in Device_WiFi_SSID

[Copilot]

The else branches handling empty/failed getJsonRPCData() responses were logging "curl init failed", which was inaccurate — curl may have succeeded but returned an empty or unparseable response.

Changes

• GetConnectedSSID: Replaced the if (!response.empty()) guard with an explicit early-exit pattern:

  if (response.empty())
  {
      RDK_LOG(RDK_LOG_ERROR, LOG_TR69HOSTIF,
          "%s: Empty response received from NetworkManager.GetConnectedSSID JSON-RPC request\n",
          __FUNCTION__);
      return NOK;
  }

• GetAvailableInterfaces / GetWifiState: Replaced "curl init failed" in the else branches with "getJsonRPCData() failed" to accurately reflect the actual failure point.

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