Fix test_downsample_cells.py

Stratify is set to false in this test, therefore min_threshold is not used. min_threshold = 5 assignment for this test was unneeded and removed.

Author: Chloe-Thangavelu

tests/test_data_utils/test_downsample_cells.py

@@ -221,8 +221,7 @@ def test_anndata_input(self):
             n_samples = 1,
             stratify = False,
             rand = True,
-            combined_col_name= '_combined_',
-            min_threshold= 5
+            combined_col_name= '_combined_'
         )
 
         # confirm the downsampled_df is an anndata object