sdbus++: interface namespaces closed backward

In the generated interface files, the closing brackets for the
namespaces were commented backwards. com.example generated:

    } // namespace com
    } // namespace example

Change-Id: I57a9d3b3ba30c2a90f243ba447c7295da258bd58
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/tools/templates/interface.mako.server.cpp b/tools/templates/interface.mako.server.cpp
index b606033..cb4ca29 100644
--- a/tools/templates/interface.mako.server.cpp
+++ b/tools/templates/interface.mako.server.cpp
@@ -98,7 +98,7 @@
     vtable::end()
 };
 
-    % for s in namespaces:
+    % for s in reversed(namespaces):
 } // namespace ${s}
     % endfor
 } // namespace server