Add support for editing a subuser

resources/scripts/state/server/subusers.ts

@@ -38,7 +38,20 @@ const subusers: ServerSubuserStore = {
     }),
 
     appendSubuser: action((state, payload) => {
-        state.data = [ ...state.data.filter(user => user.uuid !== payload.uuid), payload ];
+        let matched = false;
+        state.data = [
+            ...state.data
+                .map(user => {
+                    if (user.uuid === payload.uuid) {
+                        matched = true;
+
+                        return payload;
+                    }
+
+                    return user;
+                })
+                .concat(matched ? [] : [ payload ]),
+        ];
     }),
 
     removeSubuser: action((state, payload) => {