remove unecessary batch_size arg

Author: ilan-gold

diffxpy/unit_test/test_vsrest.py

@@ -45,7 +45,6 @@ def test_null_distribution_wald(self, n_cells: int = 2000, n_genes: int = 100, n
             test="wald",
             noise_model="nb",
             sample_description=random_sample_description,
-            # batch_size=(500, 500), # why was this here?
             training_strategy="DEFAULT",
             dtype="float64"
         )
@@ -91,7 +90,6 @@ def test_null_distribution_lrt(self, n_cells: int = 2000, n_genes: int = 100):
             test="lrt",
             noise_model="nb",
             sample_description=random_sample_description,
-            # batch_size=(500, 500), # why was this here?
             training_strategy="DEFAULT",
             dtype="float64"
         )