[fix] flash tool. not working for stm32l, ok with stm32vl
[fw/stlink] / example /
drwxr-xr-x   ..
drwxr-xr-x - blink
drwxr-xr-x - blink_flash
drwxr-xr-x - lcd
drwxr-xr-x - libstm32l_discovery