python2 to python3 conversion

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I1716d022bb67b1301f771c575842175372b04bef
diff --git a/settings_manager.mako.hpp b/settings_manager.mako.hpp
index c2255b8..6f8841f 100644
--- a/settings_manager.mako.hpp
+++ b/settings_manager.mako.hpp
@@ -4,7 +4,7 @@
 <%
 import re
 from collections import defaultdict
-objects = list(settingsDict.viewkeys())
+objects = settingsDict.keys()
 sdbusplus_namespaces = []
 sdbusplus_includes = []
 props = defaultdict(list)