blue-merle script: mismatch of default values in screenshot vs. implementation

[6t8k]

For the IMEI generation method, the deterministic (d) choice is the default in the screenshot, while in the implementation, the random (r) choice is the default.

For the device shutdown vs. modem reset question, the latter (m) choice is the default in the screenshot, while in the implementation, the former (s) choice is the default.