chore: drop unused code

plugins/ps/functions

@@ -88,9 +88,6 @@ generate_scale_file() {
   if [[ ! -f $DOKKU_SCALE_FILE ]]; then
     dokku_log_info1_quiet "DOKKU_SCALE file not found in app image. Generating one based on Procfile..."
 
-    local GENERATE_SCALE_FILE_TMP_WORK_DIR=$(mktemp -d "/tmp/dokku-${DOKKU_PID}-${FUNCNAME[0]}.XXXXXX")
-    trap "rm -rf '$GENERATE_SCALE_FILE_TMP_WORK_DIR' >/dev/null" RETURN
-
     if [[ -f $DOKKU_PROCFILE ]]; then
       while read -r line || [[ -n "$line" ]]; do
         if [[ -z "$line" ]] || [[ "$line" == "#"* ]]; then