Add back button to deselect exercises

DrawerHeader.tsx

@@ -11,7 +11,7 @@ export default function DrawerHeader({
 }: {
   name: string;
   children?: JSX.Element | JSX.Element[];
-  ids?: number[],
+  ids?: unknown[],
   unSelect?: () => void,
 }) {
   const navigation = useNavigation<DrawerNavigationProp<DrawerParams>>();

ExerciseList.tsx

@@ -125,6 +125,8 @@ export default function ExerciseList() {
     <>
       <DrawerHeader
         name={names.length > 0 ? `${names.length} selected` : "Exercises"}
+        ids={names}
+        unSelect={() => setNames([])}
       >
         <ListMenu
           onClear={clear}