Fix code style in options.php

Author: OskarStark

src/ai-bundle/config/options.php

@@ -144,12 +144,13 @@
                                     if (!isset($v['prompt']) && !isset($v['include_tools'])) {
                                         throw new \InvalidArgumentException('Either "prompt" must be configured for system_prompt.');
                                     }
+
                                     return $v;
                                 })
                             ->end()
                             ->validate()
                                 ->ifTrue(function ($v) {
-                                    return is_array($v) && '' === trim($v['prompt'] ?? '');
+                                    return \is_array($v) && '' === trim($v['prompt'] ?? '');
                                 })
                                 ->thenInvalid('The "prompt" cannot be empty.')
                             ->end()