launch: fix on linux systems without flatpak

Author: BrettMayson

bin/src/commands/launch/platforms.rs

@@ -28,7 +28,7 @@ pub fn linux(args: &[String]) -> Result<Child, Error> {
         .arg("list")
         .arg("--app")
         .output()
-        .map(|o| String::from_utf8_lossy(&o.stdout).contains("com.valvesoftware.Steam"))?;
+        .map_or_else(|_| false, |o| String::from_utf8_lossy(&o.stdout).contains("com.valvesoftware.Steam"));
     let child = if flatpak {
         warn!(
             "A flatpak override will be created to grant Steam access to the .hemttout directory"