fix new clippy warnings

taskchampion/src/taskdb.rs

@@ -144,10 +144,8 @@ impl TaskDb {
         // if renumbering, clear the working set and re-add
         if renumber {
             txn.clear_working_set()?;
-            for elt in new_ws.drain(0..new_ws.len()) {
-                if let Some(uuid) = elt {
-                    txn.add_to_working_set(uuid)?;
-                }
+            for uuid in new_ws.drain(0..new_ws.len()).flatten() {
+                txn.add_to_working_set(uuid)?;
             }
         } else {
             // ..otherwise, just clear the None items determined above from the working set

taskchampion/src/workingset.rs

@@ -58,13 +58,7 @@ impl WorkingSet {
         self.by_index
             .iter()
             .enumerate()
-            .filter_map(|(index, uuid)| {
-                if let Some(uuid) = uuid {
-                    Some((index, *uuid))
-                } else {
-                    None
-                }
-            })
+            .filter_map(|(index, uuid)| uuid.as_ref().map(|uuid| (index, *uuid)))
     }
 }