Update test-diffdir output

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Update test-diffdir output

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tests/test-diffdir.out

@@ -8,8 +8,3 b' diff -r 3903775176ed b'
 +++ b/b
 @@ -0,0 +1,1 @@
 +123
-diff -r 3903775176ed b
---- /dev/null
-+++ b/b
-@@ -0,0 +1,1 @@
-+123