Add wait for tick before scrolling down in openai

We had this wait on ollama but not for openai, causing it to fail
to scroll down in certain cases.

This fixes the issue.

src/routes/(app)/+page.svelte

@@ -517,6 +517,10 @@
 
 	const sendPromptOpenAI = async (model, userPrompt, responseMessageId, _chatId) => {
 		const responseMessage = history.messages[responseMessageId];
+
+		// Wait until history/message have been updated
+		await tick();
+
 		scrollToBottom();
 
 		const docs = messages

src/routes/(app)/c/[id]/+page.svelte

@@ -527,6 +527,10 @@
 
 	const sendPromptOpenAI = async (model, userPrompt, responseMessageId, _chatId) => {
 		const responseMessage = history.messages[responseMessageId];
+
+		// Wait until history/message have been updated
+		await tick();
+
 		scrollToBottom();
 
 		const docs = messages