do not notify workers about termination if they do not sleep

I stumbled upon this because the no-sleep variants in the pulse evaluation
showed notifications in their stats.

emper/Runtime.cpp

@@ -442,7 +442,9 @@ auto Runtime::nextFiber() -> std::optional<NextFiberResult> {
 void Runtime::initiateTermination() {
 	terminateWorkers.store(true, std::memory_order_release);
 
-	workerSleepStrategy.notifyAll<CallerEnvironment::ANYWHERE>();
+	if constexpr (emper::WORKER_SLEEP) {
+		workerSleepStrategy.notifyAll<CallerEnvironment::ANYWHERE>();
+	}
 
 	if constexpr (USE_IO_COMPLETER) {
 		globalIo->initiateTermination();