Bluetooth: Shell: Workaround coverity uint comparation

The current code triggers a false positive from the heuristic "Macro
compares unsigned to 0". It's triggered because of a use of `IN_RANGE`
that checks against the extremal values of a enum type.

This patch replaces the use of `IN_RANGE` with an explicit list of the
possible values of the enum.

Fixes: https://github.com/zephyrproject-rtos/zephyr/issues/65575



Signed-off-by: Aleksander Wasaznik <aleksander.wasaznik@nordicsemi.no>