Added spaces between parameter arguments

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Tests/test_file_libtiff.py

@@ -985,7 +985,7 @@ def test_open_missing_samplesperpixel(self):
             assert_image_equal_tofile(im, "Tests/images/old-style-jpeg-compression.png")
 
     @pytest.mark.parametrize(
-        "file_name,mode,size,tile",
+        "file_name, mode, size, tile",
         [
             (
                 "tiff_wrong_bits_per_sample.tiff",