Fix Clone definition for Injector

Injectors detect that a Picker has been shut down / removed by checking
the shutdown atomic bool (which is shared with the Picker instance and
is set to `true` on Picker's Drop). Cloning Injector should create more
references to the Picker's atomic bool rather than creating new ones.
This should fix global search so that the WalkBuilder halts when the
picker is dropped.

helix-term/src/ui/picker.rs

@@ -156,7 +156,7 @@ impl<T: Item> Clone for Injector<T> {
         Injector {
             dst: self.dst.clone(),
             editor_data: self.editor_data.clone(),
-            shutown: Arc::new(AtomicBool::new(false)),
+            shutown: self.shutown.clone(),
         }
     }
 }