Checking is password changing function exists

src/freedombone-sec

     # shellcheck disable=SC2068
     for a in ${APPS_AVAILABLE[@]}
     do
-        if [[ $(function_exists "change_password_${a}") == "1" ]]; then
+        if grep -q "change_password_" "/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${a}"; then
             i=$((i+1))
             W+=("$i" "$a")
             name+=("$a")