Hyperlink of "display [event] on website" button always refers to thalia.nu (also on staging)

One-sentence description

Hyperlink of "display [event] on website" button is hardcoded always refers to thalia.nu (also on staging)

Current behaviour / Reproducing the bug

At staging.thalia.nu, the action button "display on website" (in the events admin) refers to thalia.nu

Expected behaviour

Be a relative url (to staging.thalia.nu)

Edited by Job Doesburg
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