Fix "no need for reference" clippy 1.81 lints

client/src/main.rs

@@ -290,7 +290,7 @@ fn update_hosts_file(
     for peer in peers {
         hosts_builder.add_hostname(
             peer.contents.ip,
-            &format!("{}.{}.wg", peer.contents.name, interface),
+            format!("{}.{}.wg", peer.contents.name, interface),
         );
     }
     match hosts_builder.write_to(&hosts_path).with_path(&hosts_path) {
@@ -374,7 +374,7 @@ fn install(
     if install_opts.delete_invite
         || Confirm::with_theme(&*prompts::THEME)
             .wait_for_newline(true)
-            .with_prompt(&format!(
+            .with_prompt(format!(
                 "Delete invitation file \"{}\" now? (It's no longer needed)",
                 invite.to_string_lossy().yellow()
             ))
@@ -666,7 +666,7 @@ fn uninstall(interface: &InterfaceName, opts: &Opts, yes: bool) -> Result<(), Er
 
     if yes
         || Confirm::with_theme(&*prompts::THEME)
-            .with_prompt(&format!(
+            .with_prompt(format!(
                 "Permanently delete network \"{}\"?",
                 interface.as_str_lossy().yellow()
             ))

server/src/main.rs

@@ -522,7 +522,7 @@ fn uninstall(
 ) -> Result<(), Error> {
     if yes
         || Confirm::with_theme(&*prompts::THEME)
-            .with_prompt(&format!(
+            .with_prompt(format!(
                 "Permanently delete network \"{}\"?",
                 interface.as_str_lossy().yellow()
             ))

wireguard-control/src/backends/userspace.rs

@@ -278,7 +278,7 @@ fn start_userspace_wireguard(iface: &InterfaceName) -> io::Result<Output> {
         command.args(&[iface.to_string()]).output()?
     } else {
         command
-            .env("WG_TUN_NAME_FILE", &format!("{VAR_RUN_PATH}/{iface}.name"))
+            .env("WG_TUN_NAME_FILE", format!("{VAR_RUN_PATH}/{iface}.name"))
             .args(["utun"])
             .output()?
     };