address review: fix .6_f test (enlarge integer part)

Author: skirpichev

Lib/test/test_decimal.py

@@ -1092,7 +1092,7 @@ def test_formatting(self):
             # and now for something completely different...
             ('.,', '1.23456789', '1.234,567,89'),
             ('._', '1.23456789', '1.234_567_89'),
-            ('.6_f', '1.23456789', '1.234_568'),
+            ('.6_f', '12345.23456789', '12345.234_568'),
             (',._%', '123.456789', '12,345.678_9%'),
             (',._e', '123456', '1.234_56e+5'),
             (',.4_e', '123456', '1.234_6e+5'),