fix: dont flatten forms for templates (#2386)

Templates shouldn't have their form flattened until they're
converted to a document.

packages/lib/server-only/envelope/create-envelope.ts

@@ -185,7 +185,9 @@ export const createEnvelope = async ({
 
         const buffer = await getFileServerSide(documentData);
 
-        const normalizedPdf = await makeNormalizedPdf(Buffer.from(buffer));
+        const normalizedPdf = await makeNormalizedPdf(Buffer.from(buffer), {
+          flattenForm: type !== EnvelopeType.TEMPLATE,
+        });
 
         const titleToUse = item.title || title;