Update test output since bug is fixed

since this fix:
-        "The expected difference {0} does not match actual difference {1}".format(expected_diff.step.context.difference)
+        "The expected difference {0} does not match actual difference {1}".format(
+            expected_diff, step.context.difference
+        )

we get the propper error message now

Author: fliiiix

tests/output/unix/everything_with_failures_dot_formatter.txt

@@ -3,7 +3,7 @@
 Failures:
 features/everything_with_failures.feature: Subtract numbers wrongly
     Then I expect the difference to be 3
-      AttributeError: 'int' object has no attribute 'step'
+      AssertionError: The expected difference 3 does not match actual difference 2
 
 features/everything_with_failures.feature: A Scenario Outline - row 0
     Then I expect the sum to be 3

tests/output/windows/everything_with_failures_dot_formatter.txt

@@ -3,7 +3,7 @@
 Failures:
 features\everything_with_failures.feature: Subtract numbers wrongly
     Then I expect the difference to be 3
-      AttributeError: 'int' object has no attribute 'step'
+      AssertionError: The expected difference 3 does not match actual difference 2
 
 features\everything_with_failures.feature: A Scenario Outline - row 0
     Then I expect the sum to be 3