Fix review issues: key_prefix length, count validation, WAL log, timeout comment, pointless temp var

gns3server/api/routes/controller/projects.py

@@ -618,6 +618,4 @@ async def create_node_from_template(
     node = await project.add_node_from_template(
         template, x=template_usage.x, y=template_usage.y, name=template_usage.name, compute_id=template_usage.compute_id
     )
-
-    result = node.asdict()
-    return result
+    return node.asdict()