Remove deleted users

• Remove deleted users from list of fetched users
• Update tests

src/store/modules/users.js

@@ -67,7 +67,7 @@ const users = {
     },
     async DeleteUser({ commit, dispatch, getters, state }, user) {
       const { nickname } = await deleteUser(user.nickname, getters.authHost, getters.token)
-      const users = state.fetchedUsers.filter(user => user.nickname !== data)
+      const users = state.fetchedUsers.filter(user => user.nickname !== nickname)
       commit('SET_USERS', users)
     },
     async FetchUsers({ commit, state, getters }, { page }) {