Fix --handles_are_files hanging the fetch process by using a much simpler file reading method

src/editor/commands/fetch.rs

@@ -15,15 +15,9 @@ pub fn fetch(
 ) {
     let handles = handles.flat_map(|handle| {
         if handles_are_files {
-            match std::fs::File::open(&handle) {
+            match std::fs::read_to_string(&handle) {
                 Ok(file) => {
-                    let mut file = BufReader::new(file);
-                    let mut handles = vec![];
-                    let mut buf = String::new();
-                    while file.read_line(&mut buf).is_ok() {
-                        handles.push(buf);
-                        buf = String::new();
-                    }
+                    let handles = file.lines().map(str::to_string).collect::<Vec<_>>();
                     info!("Read {} handles from {handle}", handles.len());
                     handles
                 }