Group agent-shipped tools together in demo configuration

Move SimilaritySearch tool configuration below Clock tool in
demo/config/packages/ai.yaml since both are shipped by the agent
component, keeping them separate from third-party toolbox tools.

Author: OskarStark

demo/config/packages/ai.yaml

@@ -75,13 +75,13 @@ services:
         autoconfigure: true
 
     # Symfony\AI\Agent\Toolbox\Tool\Clock: ~
+    Symfony\AI\Agent\Toolbox\Tool\SimilaritySearch:
+        $vectorizer: '@ai.vectorizer.openai'
+        $store: '@ai.store.chroma_db.symfonycon'
     # Symfony\AI\Toolbox\Tool\OpenMeteo: ~
     # Symfony\AI\Toolbox\Tool\SerpApi:
     #     $apiKey: '%env(SERP_API_KEY)%'
     Symfony\AI\Toolbox\Tool\Wikipedia: ~
-    Symfony\AI\Agent\Toolbox\Tool\SimilaritySearch:
-        $vectorizer: '@ai.vectorizer.openai'
-        $store: '@ai.store.chroma_db.symfonycon'
 
     Symfony\AI\Store\Document\Loader\RssFeedLoader: ~
     Symfony\AI\Store\Document\Transformer\TextTrimTransformer: ~