MBS-9360: Hardcore tts model param in case of OpenAI TTS via Azure

tools/openaitts/classes/connector.php

@@ -47,6 +47,9 @@ public function get_prompt_data(string $prompttext, array $requestoptions): arra
         if (!$this->instance->azure_enabled()) {
             // If azure is enabled, the model will be preconfigured in the azure resource, so we do not need to send it.
             $data['model'] = $this->instance->get_model();
+        } else {
+            // OpenAI via Azure expects the model to be sent despite being preconfigured in the resource. So we hardcode "tts".
+            $data['model'] = 'tts';
         }
 
         return $data;