Pass params the usual way when redirecting to export plugin controllers

[dormi]

Summary

When we redirect to the export plugin controller, we were using the session to pass params. But they can be passed as normal params too.

In the case of the the html_export plugin, the rendered html opens in a new tab, which is nice. But problems arise if we have another tab opened with another project html exported. When we refresh the browser tabs, since we are getting the params from the session, we always render using the last export params we stored in the session. And that could mean rendering a different project with a different template.

Passing params as normal params fixes this.

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