This patch explicitly adds the following Btech clones to the UI: * Jetstream JT2705M * Juentai JT-6188 Mini * Juentai JT-6188 Plus * Sainsonic GT-890

This radios do show properly now in the download/upload dialog as vendor/model, this will ease the handling of clones in the user side.

But it has a catch and the users will be notified on the chirp_user list: when you opens a saved image of a clone it will show in Chirp as the real radio, not the clone.