Allow processing low priority threads on calling thread in the WTP.

This fixes a recent regression. In theory, low priority tasks should always go to the queue and never be executed on the calling thread. However, when using NO_THREADS build, all tasks need to execute on the calling thread.

Author: clayjohn

core/object/worker_thread_pool.cpp

@@ -225,7 +225,7 @@ void WorkerThreadPool::_post_tasks(Task **p_tasks, uint32_t p_count, bool p_high
 	// in custom builds.
 
 	// Avoid calling pump tasks or low priority tasks from the calling thread.
-	bool process_on_calling_thread = threads.is_empty() && p_high_priority && !p_pump_task;
+	bool process_on_calling_thread = threads.is_empty() && !p_pump_task;
 	if (process_on_calling_thread) {
 		p_lock.temp_unlock();
 		for (uint32_t i = 0; i < p_count; i++) {