Fix `/api/user` POSTs to return the same data as PUT

The previous code returned the result of the `db/insert!` this changes
that to user the same `fetch-user` function that is used elsewhere in
the user API to ensure we get the same data back (specifically looking
for `is_active`).

src/metabase/api/user.clj

@@ -60,7 +60,8 @@
   (api/check-superuser)
   (api/checkp (not (db/exists? User :email email))
     "email" "Email address already in use.")
-  (user/invite-user! first_name last_name email password @api/*current-user*))
+  (let [new-user-id (u/get-id (user/invite-user! first_name last_name email password @api/*current-user*))]
+    (fetch-user :id new-user-id)))
 
 (api/defendpoint GET "/current"
   "Fetch the current `User`."

test/metabase/api/user_test.clj

@@ -80,22 +80,20 @@
 (let [user-name (random-name)
       email     (str user-name "@metabase.com")]
   (expect
-    {:email        email
-     :first_name   user-name
-     :last_name    user-name
-     :common_name  (str user-name " " user-name)
-     :is_superuser false
-     :is_qbnewb    true
-     :is_active    true}
+    (merge user-defaults
+           {:email        email
+            :first_name   user-name
+            :last_name    user-name
+            :common_name  (str user-name " " user-name)})
     (et/with-fake-inbox
-      ((user->client :crowberto) :post 200 "user" {:first_name user-name
-                                                   :last_name  user-name
-                                                   :email      email})
-      (u/prog1 (db/select-one [User :email :first_name :last_name :is_superuser :is_qbnewb :is_active]
-                              :email email)
-               ;; clean up after ourselves
-               (db/delete! User :email email)))))
-
+      (try
+        (tu/boolean-ids-and-timestamps
+         ((user->client :crowberto) :post 200 "user" {:first_name user-name
+                                                      :last_name  user-name
+                                                      :email      email}))
+        (finally
+          ;; clean up after ourselves
+          (db/delete! User :email email))))))
 
 ;; Test that reactivating a disabled account works
 (expect