refactor(app): 优化邮件模板

app/Http/Controllers/Mobile/UserController.php

@@ -172,7 +172,9 @@ class UserController extends CommonController
             }
             $model->password = Hash::make($all['password']);
         }
+        if (isset($all['username']) && !empty($all['username'])) {
             $all['name'] = $all['username'];
+        }
         if (isset($all['name']) && !empty($all['name'])) {
             $all['letter'] = strtoupper(Pinyin::abbr(mb_substr($all['name'], 0, 1))[0]);
         }