shell: improve interactive mode

kernel/libk/src/vfs/node/traits.rs

@@ -150,10 +150,7 @@ pub trait DirectoryImpl: CommonImpl {
     }
 
     fn contains(&self, node: &NodeRef, name: &Filename) -> bool {
-        match self.lookup(node, name) {
-            Ok(_) => true,
-            Err(_) => false,
-        }
+        self.lookup(node, name).is_ok()
     }
 
     /// Returns the "length" of the directory in entries