fix: ignore subdirs when walking through dirs

This fixes a bug where save-sync track would never work because we would
try to interpret a directory as a file (which held some data we would
then try to read)

client/src/archive.rs

@@ -109,8 +109,13 @@ impl Archive {
             for maybe_entry in WalkDir::new(path) {
                 match maybe_entry {
                     Ok(entry) => {
-                        let game_file = GameFile::new(entry.path())?;
-                        game_files.push(game_file);
+                        if entry.path().is_file() {
+                            let game_file = GameFile::new(entry.path())?;
+                            game_files.push(game_file);
+                        }
+
+                        // FIXME: WalkDir will also return the paths of files. DO we want to track these?
+                        // if so, how will be do that?
                     }
                     Err(err) => {
                         let io_err: std::io::Error = err.into();