Consistently set default background PDFs on server, not client (#2840)

Co-authored-by: Martin Gross <gross@rami.io>

src/tests/plugins/badges/test_api.py

@@ -52,7 +52,7 @@ RES_LAYOUT = {
     'default': True,
     'item_assignments': [{'item': 1}],
     'layout': [{'a': 2}],
-    'background': None
+    'background': 'http://example.com/static/pretixplugins/badges/badge_default_a6l.pdf'
 }
 
 

src/tests/plugins/ticketoutputpdf/test_api.py

@@ -52,7 +52,7 @@ RES_LAYOUT = {
     'default': True,
     'item_assignments': [{'item': 1, 'sales_channel': 'web'}],
     'layout': [{'a': 2}],
-    'background': None
+    'background': 'http://example.com/static/pretixpresale/pdf/ticket_default_a4.pdf'
 }