Revert "close instant prompt descriptors in worker"

This reverts commit 646a826440.

internal/worker.zsh

@@ -182,9 +182,6 @@ function _p9k_worker_start() {
 
     sysopen -r -o cloexec -u _p9k__worker_resp_fd <(
       exec 0</dev/null
-      (( __p9k_fd_0 )) && exec {__p9k_fd_0}>&-
-      (( __p9k_fd_1 )) && exec {__p9k_fd_1}>&-
-      (( __p9k_fd_2 )) && exec {__p9k_fd_2}>&-
       if [[ -n $_POWERLEVEL9K_WORKER_LOG_LEVEL ]]; then
         exec 2>$_p9k__worker_file_prefix.log
         setopt xtrace