frontend: Fix users api

When saving settings one can update the current users name and mail.
The API however only put the user without specifying the user id,
making the second part of the saving settings operation fail.

Adjust API to match backend.

Author: Emily Ehlert

frontend/src/api/users.ts

@@ -15,5 +15,5 @@ export const deleteUser = async (id: number): Promise<void> => {
 };
 
 export const updateUser = async (user: User): Promise<void> => {
-    return await ApiClient.put<void>(`/users`, user);
+    return await ApiClient.put<void>(`/users/${user.id}`, user);
 };