Don't overwrite config files if user responds 'No' instead of just 'N'.

I was messing with my config files in MCC Admin and accidentally overwrote my mauth_key without realizing it, because I responded "no" to the prompt instead of just "n".  This change addresses this by only looking at the first letter of the user's response.

23 scenarios (23 passed)
87 steps (87 passed)
0m17.656s