UAS: added offboard mode name

src/uas/UAS.cc

@@ -3354,6 +3354,8 @@ QString UAS::getShortModeTextFor(uint8_t base_mode, uint32_t custom_mode, int au
                 } else if (px4_mode.sub_mode == PX4_CUSTOM_SUB_MODE_AUTO_LAND) {
                     mode += "|LAND";
                 }
+            } else if (px4_mode.main_mode == PX4_CUSTOM_MAIN_MODE_OFFBOARD) {
+                mode += "|OFFBOARD";
             }
         }
     }