Update undo test

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Update undo test

manifest hash: b168c0b983b6aaeaf9cf4c74d65047eb4a5629f9
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tests/test-undo.out

@@ -19,7 +19,7 b' summary: test'
 
 + hg status
 + hg undo
-attempting to rollback last transaction
+rolling back last transaction
 + hg verify
 checking changesets
 checking manifests