style: fix clippy collapsible_if warnings in nvim-core

linux-nvim/tests/integration_test.rs

@@ -1,6 +1,6 @@
 #![cfg(unix)]
 
-use serde_json::{json, Value};
+use serde_json::{Value, json};
 use std::io::{BufRead, BufReader, Read, Write};
 use std::process::{Command, Stdio};