refactor(flash_klipper.sh): select python version of klippy-env

Signed-off-by: Dominik Willner th33xitus@gmail.com

scripts/klipper.sh

@@ -511,4 +511,11 @@ function get_klipper_cfg_dir() {
     cfg_dir="${custom_klipper_cfg_loc}"
   fi
   echo "${cfg_dir}"
+}
+
+### returns the major python version the klippy-env was created with
+function get_klipper_python_ver() {
+  local version
+  version=$("${KLIPPY_ENV}"/bin/python --version 2>&1 | cut -d" " -f2 | cut -d"." -f1)
+  echo "${version}"
 }