feat(users): add leadOrActual roster display preference

Adds a 'leadOrActual' select preference to the display group so users
can choose between 'Lead' or 'Actual' when reviewing the unit roster.

src/collections/users/Users.ts

@@ -210,6 +210,16 @@ export const Users: CollectionConfig = {
               type: "checkbox",
               defaultValue: false,
             },
+            {
+              name: "leadOrActual",
+              label: 'Use "Lead" or "Actual" when reviewing the unit roster',
+              type: "select",
+              options: [
+                { label: "Lead", value: "lead" },
+                { label: "Actual", value: "actual" },
+              ],
+              defaultValue: "lead",
+            }
           ],
         },
         {