fix: fix compute_logprobs_parallel import

Author: gitlost-murali

src/forge/actors/reference_model.py

@@ -17,8 +17,7 @@
 from forge.controller import ForgeActor
 from forge.observability.metrics import record_metric, Reduce
 from forge.observability.perf_tracker import Tracer
-from forge.util.ops import compute_logprobs
-from forge.util.parallel_logprobs import compute_logprobs_parallel
+from forge.util.ops import compute_logprobs, compute_logprobs_parallel
 from monarch.actor import current_rank, current_size, endpoint
 from torch.distributed.tensor import DTensor