scripts: case insensitive sort device names

When selecting devices from the Target Devices menu, the brand choices
of naming makes it confusing to find particular devices by name, as the
sorting is case sensitve.  AirTight came after ALFA, and devolo and
jjPlus both came after Zyxel.

This does _not_ apply to the Target Profile list, as that includes
"Default - all profiles" inside the profile list.

Signed-off-by: Karl Palsson <karlp@etactica.com>