Fix typo in sponsor initial email

templates/email/partners_initial_mail.html

@@ -24,7 +24,7 @@
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-    In <a href="https://scipost.org/static/scipost/SPB/SciPost_Supporting_Partner_Agreement.pdf">the agreement template</a>, you will find many more specific details about our operations, requirements and funding strategy. I would greatly appreciate if you took a few minutes to read through this document.
+    In <a href="https://scipost.org/static/sponsors/SciPost_Sponsorship_Agreement.pdf">the agreement template</a>, you will find many more specific details about our operations, requirements and funding strategy. I would greatly appreciate if you took a few minutes to read through this document.
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