Fix EventService Subscriptions URI

GET on subscriptions URI returns NotFound error
this commit fixes URI issues

Tested by:
GET https://${bmc}/redfish/v1/EventService/Subscriptions/3800595217

Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
Change-Id: I2952694e4786dc78248335559c8aec795bfabd6e
diff --git a/redfish-core/lib/event_service.hpp b/redfish-core/lib/event_service.hpp
index 1330438..98c67c6 100644
--- a/redfish-core/lib/event_service.hpp
+++ b/redfish-core/lib/event_service.hpp
@@ -488,7 +488,7 @@
 
 inline void requestRoutesEventDestination(App& app)
 {
-    BMCWEB_ROUTE(app, "redfish/v1/EventService/Subscriptions/<str>/")
+    BMCWEB_ROUTE(app, "/redfish/v1/EventService/Subscriptions/<str>/")
         .privileges(redfish::privileges::getEventDestination)
         .methods(boost::beast::http::verb::get)(
             [](const crow::Request&,
@@ -540,7 +540,7 @@
             });
     /////redfish/v1/EventService/Subscriptions/
     // ConfigureManager
-    BMCWEB_ROUTE(app, "redfish/v1/EventService/Subscriptions/<str>/")
+    BMCWEB_ROUTE(app, "/redfish/v1/EventService/Subscriptions/<str>/")
         // The below privilege is wrong, it should be ConfigureManager OR
         // ConfigureSelf
         // TODO(ed) follow up with DMTF spec and understand ConfigureSelf
@@ -597,7 +597,7 @@
 
                 EventServiceManager::getInstance().updateSubscriptionData();
             });
-    BMCWEB_ROUTE(app, "redfish/v1/EventService/Subscriptions/<str>/")
+    BMCWEB_ROUTE(app, "/redfish/v1/EventService/Subscriptions/<str>/")
         // The below privilege is wrong, it should be ConfigureManager OR
         // ConfigureSelf
         //.privileges(redfish::privileges::deleteEventDestination)