log_services: fix wrong AdditionalDataURI

fix wrong AdditionalDataURI of EventLog entries

Tested:
[Before]
$ curl -s -u root:0penBmc -k https://10.10.11.203/redfish/v1/Systems/system/LogServices/EventLog/Entries/60 |\
> python -c 'import sys, json; print(json.load(sys.stdin)["AdditionalDataURI"])'
/redfish/v1/Systems/system/LogServices/EventLog/attachment/60

$ curl -s -u root:0penBmc -k https://10.10.11.203/redfish/v1/Systems/system/LogServices/EventLog/attachment/60
Not Found

[After]
$ curl -s -u root:0penBmc -k https://10.10.11.203/redfish/v1/Systems/system/LogServices/EventLog/Entries/60 |\
> python -c 'import sys, json; print(json.load(sys.stdin)["AdditionalDataURI"])'
/redfish/v1/Systems/system/LogServices/EventLog/Entries/60/attachment

$ curl -s -u root:0penBmc -k https://10.10.11.203/redfish/v1/Systems/system/LogServices/EventLog/Entries/60/attachment
BQAAADwAAAAGAAAAEeFXk4ABAAAtAAAAAAAAAHh5ei5vcGVuYm1jX3Byb2plY3QuTG9nZ2luZy5TRUwuRXJyb3IuQ3JlYXRlZAYAAAAAAAAACwAAAAAAAABFVkVOVF9ESVI9MQ8AAAAAAAAAR0VORVJBVE9SX0lEPTMyDQAAAAAAAABSRUNPUkRfVFlQRT0yEgAAAAAAAABTRU5TT1JfREFUQT01MjAyQzE6AAAAAAAAAFNFTlNPUl9QQVRIPS94eXovb3BlbmJtY19wcm9qZWN0L3NlbnNvcnMvdm9sdGFnZS9QMTJWX0ZBTjEIAAAAAAAAAF9QSUQ9MzAxAAAAAAAAAAAAIAAAAAAAAAAyLjEyLjAtZGV2LTEwOTQtZ2MzNDk4NzlmNi1kaXJ0eRHhV5OAAQAAAAAAAAAAAAAAAAAAAAAAAA==

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I859638a942a0afcb57f68d6a6613d5c3498ab3be
diff --git a/redfish-core/lib/log_services.hpp b/redfish-core/lib/log_services.hpp
index 8ab94cc..0a78009 100644
--- a/redfish-core/lib/log_services.hpp
+++ b/redfish-core/lib/log_services.hpp
@@ -1596,8 +1596,8 @@
                     if (filePath != nullptr)
                     {
                         asyncResp->res.jsonValue["AdditionalDataURI"] =
-                            "/redfish/v1/Systems/system/LogServices/EventLog/attachment/" +
-                            std::to_string(*id);
+                            "/redfish/v1/Systems/system/LogServices/EventLog/Entries/" +
+                            std::to_string(*id) + "/attachment";
                     }
                 },
                 "xyz.openbmc_project.Logging",