bitbake: runqueue: Fix scenequeue to pass file descriptors, not a float

This was missed off in a previous patch.

(Bitbake rev: ad7664edd40fa46e6f6fec2144403e3b6fc3a639)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/runqueue.py

@@ -1723,7 +1723,7 @@ class RunQueueExecuteScenequeue(RunQueueExecute):
 
         if self.stats.active > 0:
             self.rq.read_workers()
-            return 0.5
+            return self.rq.active_fds()
 
         # Convert scenequeue_covered task numbers into full taskgraph ids
         oldcovered = self.scenequeue_covered