remove unused mutabilities

src/library.rs

@@ -173,7 +173,7 @@ impl Library {
 
     fn append_or_update(&self, updated: &Playlist) -> usize {
         let mut store = self.playlists.write().expect("can't writelock playlists");
-        for (index, mut local) in store.iter_mut().enumerate() {
+        for (index, local) in store.iter_mut().enumerate() {
             if local.id == updated.id {
                 *local = updated.clone();
                 return index;

src/ui/search.rs

@@ -115,7 +115,7 @@ impl SearchView {
         _append: bool,
     ) -> u32 {
         if let Some(results) = spotify.track(&query) {
-            let mut t = vec![(&results).into()];
+            let t = vec![(&results).into()];
             let mut r = tracks.write().unwrap();
             *r = t;
             return 1;