Revert "rename UsermanagerDatabaseSeeder"

This reverts commit ca9404581e.

Database/Seeders/UserManagerDatabaseSeeder.php

@@ -0,0 +1,23 @@
+<?php
+
+    namespace Modules\Usermanager\Database\Seeders;
+
+    use Illuminate\Database\Seeder;
+
+    class UsermanagerDatabaseSeeder extends Seeder
+    {
+        /**
+         * Run the database seeds.
+         *
+         * @return void
+         */
+        public function run()
+        {
+            $this->call([
+                PermissionGroupSeeder::class,
+                RolesSeeder::class,
+                PermissionsSeeder::class,
+                UsersSeeder::class
+            ]);
+        }
+    }