Fix 1 new Clippy warning

I don't like the other ones

Cargo.toml

@@ -150,6 +150,7 @@ dinit = []
 
 [lints.clippy]
 new_without_default = "allow"
+collapsible_match = "allow"
 
 [profile.release]
 debug = "line-tables-only"

src/ipc/client.rs

@@ -193,7 +193,7 @@ pub fn handle_msg(mut msg: Msg, json: bool) -> anyhow::Result<()> {
                 return Ok(());
             }
 
-            windows.sort_unstable_by(|a, b| a.id.cmp(&b.id));
+            windows.sort_unstable_by_key(|a| a.id);
 
             for window in windows {
                 print_window(&window);

src/layout/floating.rs

@@ -490,6 +490,7 @@ impl<W: LayoutElement> FloatingSpace<W> {
         // Now, descendants is in back-to-front order, and repositioning them in the front-to-back
         // order will preserve the subsequent indices and work out right.
         let mut idx = idx;
+        #[allow(clippy::explicit_counter_loop)]
         for descendant_idx in descendants.into_iter().rev() {
             self.raise_window(descendant_idx, idx);
             idx += 1;