Fix cluster master to look for processing jobs

- Queue manager marks jobs as processing, cluster master assigns them
- Changed query back to look for processing jobs without job_id

vidai/cluster_master.py

@@ -1292,7 +1292,7 @@ class ClusterMaster:
                 from .database import get_db_connection
                 conn = get_db_connection()
                 cursor = conn.cursor()
-                cursor.execute('SELECT * FROM processing_queue WHERE status = ? AND (job_id IS NULL OR job_id = ?)', ('queued', ''))
+                cursor.execute('SELECT * FROM processing_queue WHERE status = ? AND (job_id IS NULL OR job_id = ?)', ('processing', ''))
                 jobs = cursor.fetchall()
                 conn.close()