Bluetooth: tests: Update EDTT configuration for easier debugging

Update EDTT default configuration to make it easier to debug. The
use of maximum log level to restrict default output caused some
confusion. Instead remove debug options to reduce the default log
output. Enabling debug logs is now similar to other samples and tests.

Remove options commented out, no need to keep them.
Move comment to the matching CONFIG.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>