Fixed incorrect arg type.

runcher/src/app_ui/mod.rs

@@ -516,7 +516,7 @@ impl AppUI {
 
         // Check that Steam is running, so any usage of the Steamworks API doesn't silently fail.
         let sys = sysinfo::System::new_with_specifics(sysinfo::RefreshKind::new().with_processes(sysinfo::ProcessRefreshKind::new()));
-        if sys.processes_by_exact_name("steam.exe").count() == 0 {
+        if sys.processes_by_exact_name("steam.exe".as_ref()).count() == 0 {
             show_dialog(app_ui.main_window(), "Steam is not running. Make sure Steam is running or some parts of the launcher may not work as expected.", false);
             exit(1)
         }