match: Fix propertiesChangedNamespace method

It should use arg0namespace instead of argN in the
propertiesChangedNamespace method.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: Ia73a30c875ebbe9ec070094ee78085e9fd596ddf
diff --git a/include/sdbusplus/bus/match.hpp b/include/sdbusplus/bus/match.hpp
index 3032712..9eb13a0 100644
--- a/include/sdbusplus/bus/match.hpp
+++ b/include/sdbusplus/bus/match.hpp
@@ -202,7 +202,7 @@
                                        const std::string& i)
 {
     return type::signal() + path_namespace(p) + member("PropertiesChanged"s) +
-           interface("org.freedesktop.DBus.Properties"s) + argN(0, i);
+           interface("org.freedesktop.DBus.Properties"s) + arg0namespace(i);
 }
 /**
  * @brief Constructs a NameOwnerChanged match string for a service name