misc: don't include "enable" action on readonly forms (#4960)

wcs/admin/forms.py

@@ -142,6 +142,8 @@ class FieldsDirectory(FieldsDirectory):
     readonly_message = N_('This form is readonly.')
 
     def index_bottom(self):
+        if self.objectdef.is_readonly():
+            return
         if hasattr(self.objectdef, str('disabled')) and self.objectdef.disabled:
             r = TemplateIO(html=True)
             r += htmltext('<div class="warningnotice">')