Fix megaatmega2560 test (#16069)

buildroot/share/tests/megaatmega2560-tests

 #
 # SCARA with TMC2130
 #
-use_example_configs SCARA
+use_example_configs SCARA/Morgan
 opt_set LCD_LANGUAGE es
 opt_enable USE_ZMIN_PLUG FIX_MOUNTED_PROBE AUTO_BED_LEVELING_BILINEAR PAUSE_BEFORE_DEPLOY_STOW \
            MKS_12864OLED EEPROM_SETTINGS EEPROM_CHITCHAT M114_DETAIL \