Fix comparison for proxy/legacy mode

After sdbusplus made available string path wrapper VM code has been
updated to use it.  This makes legacy mode unusable as appropriate
change introduced a problem with comparison of DBus object path, which
is now fixed.

Tested:
After applying this fix, legacy mode has InsertMedia action enabled
again.

Change-Id: I6339ae2977faacf50ce708199aaf3b13b4314398
Signed-off-by: Przemyslaw Czarnowski <przemyslaw.hawrylewicz.czarnowski@intel.com>
diff --git a/redfish-core/lib/virtual_media.hpp b/redfish-core/lib/virtual_media.hpp
index 9667c71..685ee5c 100644
--- a/redfish-core/lib/virtual_media.hpp
+++ b/redfish-core/lib/virtual_media.hpp
@@ -253,10 +253,24 @@
                     continue;
                 }
 
+                // "Legacy"/"Proxy"
+                auto mode = item.first.parent_path();
+                // "VirtualMedia"
+                auto type = mode.parent_path();
+                if (mode.filename().empty() || type.filename().empty())
+                {
+                    continue;
+                }
+
+                if (type.filename() != "VirtualMedia")
+                {
+                    continue;
+                }
+
                 aResp->res.jsonValue = vmItemTemplate(name, resName);
 
                 // Check if dbus path is Legacy type
-                if (thispath.find("VirtualMedia/Legacy") != std::string::npos)
+                if (mode.filename() == "Legacy")
                 {
                     aResp->res.jsonValue["Actions"]["#VirtualMedia.InsertMedia"]
                                         ["target"] =