[MagpieTTS] fix val dataloader config: set seed and shard_seed=randomized to ensure deterministic multi-GPU eval (NVIDIA-NeMo#15427)

Signed-off-by: Xuesong Yang <1646669+XuesongYang@users.noreply.github.com>

Author: XuesongYang

examples/tts/conf/magpietts/magpietts_lhotse.yaml

@@ -108,6 +108,8 @@ model:
       use_bucketing: false
       force_finite: true
       force_map_dataset: true
+      seed: 42
+      shard_seed: "randomized"
       drop_last: false
       shuffle: false
       num_workers: 2

examples/tts/conf/magpietts/magpietts_lhotse_moe.yaml

@@ -112,6 +112,8 @@ model:
       use_bucketing: false
       force_finite: true
       force_map_dataset: true
+      seed: 42
+      shard_seed: "randomized"
       drop_last: false
       shuffle: false
       num_workers: 2