Ensure default config values are present

Moving builtin.omwscripts out of the root openmw.cfg means we actually might need to use the defaults, so need to have some.

components/files/configurationmanager.cpp

@@ -68,6 +68,9 @@ namespace Files
         bool silent = mSilent;
         mSilent = quiet;
 
+        // ensure defaults are present
+        bpo::store(bpo::parsed_options(&description), variables);
+
         std::optional<bpo::variables_map> config = loadConfig(mFixedPath.getLocalPath(), description);
         if (config)
             mActiveConfigPaths.push_back(mFixedPath.getLocalPath());