Remove dead partner_donation_id from donate hrefs

Every.org widget ignores this param (confirmed in their source).
visitor_id is already carried inside partner_metadata.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vinogradovkonst

src/layouts/Layout.astro

@@ -346,11 +346,10 @@ import { OpenPanelComponent } from '@openpanel/astro';
 
     document.querySelectorAll('a[href*="every.org/osendowment"]').forEach((link) => {
         const href = link.getAttribute('href');
-        if (href.includes('partner_donation_id')) return;
+        if (href.includes('partner_metadata')) return;
         const [base, hash] = href.split('#');
         link.setAttribute('href',
-            base + '&partner_donation_id=' + encodeURIComponent(window.__oseVisitorId)
-            + '&partner_metadata=' + encodeURIComponent(metadataB64)
+            base + '&partner_metadata=' + encodeURIComponent(metadataB64)
             + (hash ? '#' + hash : ''));
     });