misc: limit inspect view to form_* variables (#59674)

wcs/backoffice/management.py

@@ -3209,8 +3209,8 @@ class FormBackOfficeStatusPage(FormStatusPage):
             return v
 
         for k in sorted(substvars.get_flat_keys()):
-            if k in ('attachments',):
-                # blacklist, legacy
+            if not k.startswith('form_'):
+                # do not display legacy variables
                 continue
             k = safe(k)
             v = substvars[k]