Update libcxx/test/std/ranges/range.adaptors/range.concat/begin.pass.cpp

Co-authored-by: A. Jiang <[email protected]>

Author: changkhothuychung

libcxx/test/std/ranges/range.adaptors/range.concat/begin.pass.cpp

@@ -34,4 +34,4 @@ int main(int, char**) {
   test();
   static_assert(test());
   return 0;
-}
+}