Prevent threaded Dask workers in DistRDF backend

Author: JAGANNATHANJP

bindings/distrdf/python/DistRDF/Backends/Dask/Backend.py

@@ -115,7 +115,7 @@ def __init__(self, daskclient: Optional[Client] = None):
                 raise RuntimeError(
                     "DistRDF with Dask does not support threaded workers. "
                     "Please use processes=True and threads_per_worker=1."
-               )
+                )
 
     def optimize_npartitions(self) -> int:
         """