fix(updater): correctly restart the zsh session when the update pulled changes

lib/functions.zsh

@@ -15,11 +15,17 @@ function upgrade_oh_my_zsh() {
 
   # Run update script
   env ZSH="$ZSH" zsh -f "$ZSH/tools/upgrade.sh"
+  local ret=$?
   # Update last updated file
   zmodload zsh/datetime
   echo "LAST_EPOCH=$(( EPOCHSECONDS / 60 / 60 / 24 ))" >! "${ZSH_CACHE_DIR}/.zsh-update"
   # Remove update lock if it exists
   command rm -rf "$ZSH/log/update.lock"
+  # Restart the zsh session
+  if [[ $ret -eq 0 ]]; then
+    # Check whether to run a login shell
+    [[ "$ZSH_ARGZERO" = -* ]] && exec -l "${ZSH_ARGZERO#-}" || exec "$ZSH_ARGZERO"
+  fi
 }
 
 function take() {