Fix the file pointer in Dataset Loading for Test Split

as raised in [this issue](https://huggingface.co/datasets/dengue_filipino/discussions/3), looks like the issue came from L77. Therefore, I'm creating the PR to fix the issue (it's also raised in [another experiments using `dengue-filipino`](https://github.com/bazingagin/npc_gzip/issues/13).

dengue_filipino.py

@@ -74,7 +74,7 @@ class DengueFilipino(datasets.GeneratorBasedBuilder):
         """Returns SplitGenerators."""
         data_dir = dl_manager.download_and_extract(_URL)
         train_path = os.path.join(data_dir, "dengue", "train.csv")
-        test_path = os.path.join(data_dir, "dengue", "train.csv")
+        test_path = os.path.join(data_dir, "dengue", "test.csv")
         validation_path = os.path.join(data_dir, "dengue", "valid.csv")
 
         return [