fix playground text completion

src/lib/components/playground/Completions.svelte

@@ -6,7 +6,7 @@
 
 	import { WEBUI_BASE_URL } from '$lib/constants';
 	import { WEBUI_NAME, config, user, models, settings, showSidebar } from '$lib/stores';
-	import { generateOpenAIChatCompletion } from '$lib/apis/openai';
+	import { chatCompletion } from '$lib/apis/openai';
 
 	import { splitStream } from '$lib/utils';
 	import Selector from '$lib/components/chat/ModelSelector/Selector.svelte';
@@ -40,7 +40,7 @@
 	const textCompletionHandler = async () => {
 		const model = $models.find((model) => model.id === selectedModelId);
 
-		const [res, controller] = await generateOpenAIChatCompletion(
+		const [res, controller] = await chatCompletion(
 			localStorage.token,
 			{
 				model: model.id,