Recurse on the innter type when finding a template alias name target

The assertion that the template alias's inner type was our name target,
and that we didn't need to recurse, is failing when generating
SpiderMonkey bindings. I'm not 100% sure when this can happen, but
clearly it can, and it is easy to support, so let's support it.

Author: fitzgen

libbindgen/src/ir/item.rs

@@ -556,10 +556,6 @@ impl Item {
                         TypeKind::TemplateAlias(inner, _)
                             if for_name_checking => {
                             item = ctx.resolve_item(inner);
-                            assert_eq!(item.id(),
-                                       item.name_target(ctx,
-                                                        for_name_checking));
-                            return item.id();
                         }
                         _ => return item.id(),
                     }