Add proper permissions for role application routes, allow admins to access application api

app/Http/Requests/Api/Application/Roles/GetRoleRequest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Pterodactyl\Http\Requests\Api\Application\Roles;
+
+use Pterodactyl\Models\AdminRole;
+
+class GetRoleRequest extends GetRolesRequest
+{
+    /**
+     * Determine if the requested role exists on the Panel.
+     *
+     * @return bool
+     */
+    public function resourceExists(): bool
+    {
+        $role = $this->route()->parameter('role');
+
+        return $role instanceof AdminRole && $role->exists;
+    }
+}