fixed spacing

tests/test_dpi_font.py

@@ -1,6 +1,7 @@
 import pytest
 from piker.ui._style import DpiAwareFont
 
+
 class MockScreen:
     def __init__(self, pdpi, ldpi, name="MockScreen"):
         self._pdpi = pdpi
@@ -16,6 +17,7 @@ class MockScreen:
     def name(self):
         return self._name
 
+
 @pytest.mark.parametrize(
     "pdpi, ldpi, expected_px",
     [