FIX rma_sale only include demo data when needed

rma_sale/__manifest__.py

@@ -15,10 +15,12 @@
     ],
     'data': [
         'security/ir.model.access.csv',
-        'data/rma_demo.xml',
         'views/rma_views.xml',
         'wizard/rma_lines_views.xml',
     ],
+    'demo': [
+        'data/rma_demo.xml',
+    ],
     'installable': True,
     'application': False,
  }