remove spurious error messages from _p9k_worker_stop

internal/worker.zsh

@@ -89,13 +89,15 @@ function _p9k_worker_invoke() {
 }
 
 function _p9k_worker_cleanup() {
-  # langinfo may not be available here.
-  eval "$__p9k_intro_no_locale"
+  # __p9k_intro bugs out here in some cases for some reason.
+  emulate -L zsh
   [[ $_p9k__worker_shell_pid == $sysparams[pid] ]] && _p9k_worker_stop
   return 0
 }
 
 function _p9k_worker_stop() {
+  # See comments in _p9k_worker_cleanup.
+  emulate -L zsh
   add-zsh-hook -D zshexit _p9k_worker_cleanup
   [[ -n $_p9k__worker_resp_fd     ]] && zle -F $_p9k__worker_resp_fd
   [[ -n $_p9k__worker_resp_fd     ]] && exec {_p9k__worker_resp_fd}>&-