Changed surfnet-2 credential to not be singleton, as it is reasonable for...

Changed surfnet-2 credential to not be singleton, as it is reasonable for people to work for multiple institutes.

pbdf/Issues/surfnet-2/description.xml

@@ -14,7 +14,7 @@
 		<en>Your Surfnet attributes obtained through SURFconext</en>
 		<nl>Uw Surfnet-attributen, verkregen via SURFconext</nl>
 	</Description>
-	<ShouldBeSingleton>true</ShouldBeSingleton>
+	<ShouldBeSingleton>false</ShouldBeSingleton>
 	<IssueURL>
 		<en>https://privacybydesign.foundation/issuance/surfnet/surfnet/</en>
 		<nl>https://privacybydesign.foundation/uitgifte/surfnet/surfnet/</nl>