Update yaml to adapt to belebele dataset changes (#2216)

lm_eval/tasks/belebele/belebele_zho_Hant.yaml

-"fewshot_split": "zho_Hant"
-"include": "_default_template_yaml"
-"task": "belebele_zho_Hant"
-"test_split": "zho_Hant"
+dataset_name: zho_Hant
+fewshot_split: test
+include: _default_template_yaml
+task: belebele_zho_Hant
+test_split: test

lm_eval/tasks/belebele/belebele_zsm_Latn.yaml

-"fewshot_split": "zsm_Latn"
-"include": "_default_template_yaml"
-"task": "belebele_zsm_Latn"
-"test_split": "zsm_Latn"
+dataset_name: zsm_Latn
+fewshot_split: test
+include: _default_template_yaml
+task: belebele_zsm_Latn
+test_split: test

lm_eval/tasks/belebele/belebele_zul_Latn.yaml

-"fewshot_split": "zul_Latn"
-"include": "_default_template_yaml"
-"task": "belebele_zul_Latn"
-"test_split": "zul_Latn"
+dataset_name: zul_Latn
+fewshot_split: test
+include: _default_template_yaml
+task: belebele_zul_Latn
+test_split: test