bug #567 [Ollama] simplify example (OskarStark)

This PR was squashed before being merged into the main branch.

Discussion
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[Ollama] simplify example

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        | --
| License       | MIT

fyi `@dollmetzer`

Commits
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0a67201 [Ollama] simplify example

Author: OskarStark

examples/ollama/chat-llama.php

@@ -18,8 +18,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('OLLAMA_HOST_URL'), http_client());
-$ollamaModel = $_SERVER['OLLAMA_MODEL'] ?? '';
-$model = new Ollama($ollamaModel);
+$model = new Ollama($_SERVER['OLLAMA_MODEL'] ?? '');
 
 $agent = new Agent($platform, $model, logger: logger());
 $messages = new MessageBag(