arc-functions: fix typo

Signed-off-by: AuxXxilium <info@auxxxilium.tech>

files/initrd/opt/arc/arc-functions.sh

@@ -1989,7 +1989,7 @@ function editGrubCfg() {
 function greplogs() {
   if [ -d "${PART1_PATH}/logs" ]; then
     rm -f "${PART1_PATH}/log.tar.gz" >/dev/null
-    tar -czf "${PART1_PATH}/log.tar.gz" "${PART1_PATH}/logs"
+    tar -czf "${PART1_PATH}/log.tar.gz" -C "${PART1_PATH}/logs"
     if [ -z "${SSH_TTY}" ]; then # web
       mv -f "${PART1_PATH}/log.tar.gz" "/var/www/data/log.tar.gz"
       chmod 644 "/var/www/data/log.tar.gz"