fix(pyenv): do not warn if PYENV_ROOT is undefined (#10162)

Co-authored-by: Terry Moschou <terry.moschou@fivecast.com>

plugins/pyenv/pyenv.plugin.zsh

@@ -62,14 +62,14 @@ if [[ $FOUND_PYENV -ne 1 ]]; then
 fi
 
 if [[ $FOUND_PYENV -eq 1 ]]; then
-  # Setup $PYENV_ROOT if not already set
   if [[ -z "$PYENV_ROOT" ]]; then
+    # This is only for backwards compatibility with users that previously relied
+    # on this plugin exporting it. pyenv itself does not require it to be exported
     export PYENV_ROOT="$(pyenv root)"
-    pyenv_config_warning 'missing $PYENV_ROOT'
   fi
 
   # Add pyenv shims to $PATH if not already added
-  if [[ -z "${path[(Re)$PYENV_ROOT/shims]}" ]]; then
+  if [[ -z "${path[(Re)$(pyenv root)/shims]}" ]]; then
     eval "$(pyenv init --path)"
     pyenv_config_warning 'missing pyenv shims in $PATH'
   fi
@@ -78,7 +78,7 @@ if [[ $FOUND_PYENV -eq 1 ]]; then
   eval "$(pyenv init - --no-rehash zsh)"
 
   # If pyenv-virtualenv exists, load it
-  if [[ -d "$PYENV_ROOT/plugins/pyenv-virtualenv" && "$ZSH_PYENV_VIRTUALENV" != false ]]; then
+  if [[ -d "$(pyenv root)/plugins/pyenv-virtualenv" && "$ZSH_PYENV_VIRTUALENV" != false ]]; then
     eval "$(pyenv virtualenv-init - zsh)"
   fi