fix(fsext): correct dummy filesystem list to match GNU behavior

- Keep 'rootfs' as dummy filesystem (suppressed by default, shown with -a)
- Remove 'binfmt_misc' from dummy list (shown by default like GNU)

This matches GNU coreutils behavior where rootfs is filtered out
by default but binfmt_misc is shown. Fixes GNU test failures.

Author: naoNao89

src/uucore/src/lib/features/fsext.rs

@@ -398,9 +398,7 @@ fn is_dummy_filesystem(fs_type: &str, mount_option: &str) -> bool {
         // for Irix 6.5
         | "ignore"
         // Linux initial root filesystem
-        | "rootfs"
-        // Binary format support pseudo-filesystem
-        | "binfmt_misc" => true,
+        | "rootfs" => true,
         _ => fs_type == "none"
             && !mount_option.contains(MOUNT_OPT_BIND)
     }
@@ -1194,11 +1192,4 @@ mod tests {
         );
     }
 
-    #[test]
-    #[cfg(all(unix, not(target_os = "redox")))]
-    // spell-checker:ignore (word) binfmt
-    fn test_binfmt_misc_is_dummy() {
-        use super::is_dummy_filesystem;
-        assert!(is_dummy_filesystem("binfmt_misc", ""));
-    }
 }