Update content of ResourceNotFound/ResourceAlreadyExists message

According to Redfish Base Message Registry definition [1], the first
argument of ResourceNotFound and ResourceAlreadyExists is the schema
name of the resource. This patch changes the first argument to non-
versioned schema name treewide.

Tested:
Verified the error message matches the definition, and Redfish Service
Validator passed.

[1] https://redfish.dmtf.org/registries/Base.1.13.0.json

Change-Id: Ib5cd853578ef0bffda1184d10827241e94faaf68
Signed-off-by: Jiaqing Zhao <jiaqing.zhao@intel.com>
diff --git a/redfish-core/lib/pcie_slots.hpp b/redfish-core/lib/pcie_slots.hpp
index 0cc570c..cff1e27 100644
--- a/redfish-core/lib/pcie_slots.hpp
+++ b/redfish-core/lib/pcie_slots.hpp
@@ -214,7 +214,7 @@
     }
     if (subtree.empty())
     {
-        messages::resourceNotFound(asyncResp->res, "#Chassis", chassisID);
+        messages::resourceNotFound(asyncResp->res, "Chassis", chassisID);
         return;
     }