fixup! fix: fix tab-space mix with tab indenation and continuation_align_style=SPACE

Author: spaceone

yapftests/format_token_test.py

@@ -30,7 +30,7 @@ def testSpace(self):
     self.assertEqual(pad, '')
 
     pad = format_token._TabbedContinuationAlignPadding(2, align_style, 2)
-    self.assertEqual(pad, ' ' * 2)
+    self.assertEqual(pad, '\t' * 2)
 
     pad = format_token._TabbedContinuationAlignPadding(5, align_style, 2)
     self.assertEqual(pad, ' ' * 5)