Thank you @ulfalizer for fixing the aquatic color theme in upstream
kconfiglib.
Now "xterm" or "screen" values of TERM environment variable is
sufficient to use our default blue menuconfig. "xterm-256color" or
"screen-256color" was necessary before this fix.
See https://github.com/espressif/esp-idf/issues/4387#issuecomment-557823262