style: remove trailing whitespace (#12303)

lib/compfix.zsh

@@ -13,7 +13,7 @@ function handle_completion_insecurities() {
   #     /usr/share/zsh/5.0.6
   #
   # Since the ignorable first line is printed to stderr and thus not captured,
-  # stderr is squelched to prevent this output from leaking to the user. 
+  # stderr is squelched to prevent this output from leaking to the user.
   local -aU insecure_dirs
   insecure_dirs=( ${(f@):-"$(compaudit 2>/dev/null)"} )