bus: fix method_return

method_return was using sd_bus_call instead of sd_bus_send.
Fix to use sd_bus_send and move into 'message' directly since
the previous arguments for having it a static method in bus is
no longer valid.

Change-Id: Ib74508e87f7e8be030db02b91368da7639cb28f3
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/tools/templates/method.mako.prototype.hpp b/tools/templates/method.mako.prototype.hpp
index 29d75c8..5e8f2ac 100644
--- a/tools/templates/method.mako.prototype.hpp
+++ b/tools/templates/method.mako.prototype.hpp
@@ -114,7 +114,7 @@
     reply.append(${returns_as_tuple_index("r")});
     % endif
 
-    sdbusplus::bus::method_return(reply);
+    reply.method_return();
 
     return 0;
 }