Show message about how to view diff even if I already saw it

[daattali]

After running a test and it asks you

Would you like to view the differences between expected and current results"

If I say no then I get a helpful message

  To view differences between expected and current results, run:
    viewTestDiff("inst/examples/colourInput/", "mytest")
  To save current results as expected results, run:
    snapshotUpdate("inst/examples/colourInput/", "mytest")

But if I choose yes and then close the diff app, then I don't get to see these messages, and now I'm left without knowing how to go back to it. Perhaps it'd be a good idea to show these messages regardless?