EZP-23478: redirection after publish form fields

> See [EZP-23478](https://jira.ez.no/browse/EZP-23478)
> See ezsystems/ezdemo#38

If a `redirect_uri` template variable is provided to `parts/website_toolbar.tpl`, adds matching form fields so that redirection after publish can be controlled.
CS: Missing WS between parenthesis