dir: ignore separator overrides if cwd is / and POWERLEVEL9K_DIR_OMIT_FIRST_CHARACTER is true

internal/p10k.zsh

@@ -1997,6 +1997,9 @@ prompt_dir() {
       parts=("${(@)parts//$'\3'}")
     fi
 
+    if [[ $_p9k__cwd == / && $_POWERLEVEL9K_DIR_OMIT_FIRST_CHARACTER == 1 ]]; then
+      local sep='/'
+    else
       local sep=''
       if (( $+parameters[_POWERLEVEL9K_DIR_PATH_SEPARATOR_FOREGROUND] ||
             $+parameters[_POWERLEVEL9K_${(U)state}_PATH_SEPARATOR_FOREGROUND] )); then
@@ -2010,6 +2013,7 @@ prompt_dir() {
       (( expand )) && _p9k_escape $_p9k__ret
       sep+=$_p9k__ret
       [[ $sep == *%* ]] && sep+=$style
+    fi
 
     local content="${(pj.$sep.)parts}"
     if (( _POWERLEVEL9K_DIR_HYPERLINK && _p9k_term_has_href )) && [[ $_p9k__cwd == /* ]]; then