Be more specific about the built-in widgets we want to avoid wrapping

To avoid wrapping the built-in widgets (e.g. `autosuggest-fetch`,
`autosuggest-toggle`), we were ignoring all widgets whose names start
with `autosuggest-`. This had the downside of preventing wrapping of
user-defined widgets whose names happened to also start with that
prefix.

By being more specific about the exact built-in widgets we want to avoid
wrapping, we can allow users to define widgets whose names start with
`autosuggest-`.

See GitHub issue #496.

src/bind.zsh

@@ -69,7 +69,7 @@ _zsh_autosuggest_bind_widgets() {
 	ignore_widgets=(
 		.\*
 		_\*
-		autosuggest-\*
+		${_ZSH_AUTOSUGGEST_BUILTIN_ACTIONS/#/autosuggest-}
 		$ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX\*
 		$ZSH_AUTOSUGGEST_IGNORE_WIDGETS
 	)

zsh-autosuggestions.zsh

@@ -199,7 +199,7 @@ _zsh_autosuggest_bind_widgets() {
 	ignore_widgets=(
 		.\*
 		_\*
-		autosuggest-\*
+		${_ZSH_AUTOSUGGEST_BUILTIN_ACTIONS/#/autosuggest-}
 		$ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX\*
 		$ZSH_AUTOSUGGEST_IGNORE_WIDGETS
 	)