Rename async pty name config var

src/widgets.zsh

@@ -55,7 +55,7 @@ _zsh_autosuggest_modify() {
 
 # Fetch a new suggestion based on what's currently in the buffer
 _zsh_autosuggest_fetch() {
-	if zpty -t "$ZSH_AUTOSUGGEST_PTY_NAME" &>/dev/null; then
+	if zpty -t "$ZSH_AUTOSUGGEST_ASYNC_PTY_NAME" &>/dev/null; then
 		_zsh_autosuggest_async_request "$BUFFER"
 	else
 		local suggestion