fix some lines_filter_map_ok clippy warnings

Author: sylvestre

src/uu/dircolors/src/dircolors.rs

@@ -136,7 +136,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         ));
     } else if files[0].eq("-") {
         let fin = BufReader::new(std::io::stdin());
-        result = parse(fin.lines().filter_map(Result::ok), &out_format, files[0]);
+        result = parse(fin.lines().map_while(Result::ok), &out_format, files[0]);
     } else {
         let path = Path::new(files[0]);
         if path.is_dir() {

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

@@ -409,7 +409,7 @@ pub fn read_fs_list() -> Result<Vec<MountInfo>, std::io::Error> {
         let reader = BufReader::new(f);
         Ok(reader
             .lines()
-            .filter_map(|line| line.ok())
+            .map_while(Result::ok)
             .filter_map(|line| {
                 let raw_data = line.split_whitespace().collect::<Vec<&str>>();
                 MountInfo::new(file_name, &raw_data)