add discovery-pane-eula to download sources (bug 615406)

migrations/115-discopane-download-source.sql

@@ -1,2 +1,4 @@
 INSERT INTO download_sources (name, type, created)
-    VALUES ('discovery-pane-details', 'full', NOW());
+    VALUES
+    ('discovery-pane-details', 'full', NOW()),
+    ('discovery-pane-eula', 'full', NOW());