ui: screens: use ips.first() instead of ips.get(0) to get main IP

This is a trick that cargo clippy has recently learned,
which means we need it to make the CI pipeline succeed.

Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>

Author: hnez

src/ui/screens/setup.rs

@@ -116,7 +116,7 @@ impl ActivatableScreen for SetupScreen {
         spawn(async move {
             while let Some(ips) = ip_stream.next().await {
                 connectivity_topic_task.modify(|prev| {
-                    let ip = ips.get(0).cloned();
+                    let ip = ips.first().cloned();
 
                     match (prev.unwrap(), ip) {
                         (Connectivity::Nothing, Some(ip)) | (Connectivity::IpOnly(_), Some(ip)) => {

src/ui/screens/system.rs

@@ -117,7 +117,7 @@ impl ActivatableScreen for SystemScreen {
                 display,
                 row_anchor(3),
                 Box::new(|ips: &Vec<String>| {
-                    let ip = ips.get(0).map(|s| s.as_str()).unwrap_or("-");
+                    let ip = ips.first().map(|s| s.as_str()).unwrap_or("-");
                     format!("IP:     {}", ip)
                 }),
             )