Fix SonarQube code smells:

1) String literals should not be duplicated.
2) Prefer using an optional chain expression instead, as it's more concise and easier to read.
3) Expected the Promise rejection reason to be an Error.

web/pgadmin/preferences/static/js/components/PreferencesComponent.jsx

@@ -111,7 +111,7 @@ function RightPanel({ schema, ...props }) {
     try {
       resolve(props.initValues);
     } catch (error) {
-      reject(error);
+      reject(new Error(error));
     }
   });