Remove Box wrappers from generics tests

The fact that Box<> is transparent to specta is already tested in
https://github.com/specta-rs/specta/blob/8095af4205453c7b9f75ebe15ad1ad5fa02eb95a/tests/tests/ts_rs/nested.rs#L17
and in
https://github.com/specta-rs/specta/blob/8095af4205453c7b9f75ebe15ad1ad5fa02eb95a/tests/tests/recursive.rs#L12

And it has nothing to do with generics.

Author: Vlad-Shcherbina

tests/tests/ts_rs/generics.rs

@@ -33,8 +33,8 @@ struct GenericAutoBound2<T: PartialEq> {
 #[specta(export = false)]
 struct Container1 {
     foo: Generic1<u32>,
-    bar: Box<HashSet<Generic1<u32>>>,
-    baz: Box<BTreeMap<String, Rc<Generic1<String>>>>,
+    bar: HashSet<Generic1<u32>>,
+    baz: BTreeMap<String, Rc<Generic1<String>>>,
 }
 
 #[test]