Allow set_thread_state to yield again if other thread is active

This change was only introduced to never yield while holding a lock in
condition_variable::notify_all. However, that was relaxed to not hold a
lock while resuming threads so we can again allow yielding in
set_thread_state.

libs/pika/threading_base/src/set_thread_state.cpp

@@ -133,7 +133,7 @@ namespace pika::threads::detail {
                 else
                 {
                     pika::execution::this_thread::detail::yield_k(
-                        k % 16, "pika::threads::detail::set_thread_state");
+                        k, "pika::threads::detail::set_thread_state");
                     ++k;
 
                     // NOLINTNEXTLINE(bugprone-branch-clone)