misc: remove ability to resize ckeditor within cell (#6608)

It's buggy thanks to the max-height forced on cells and there's now a maximize
button that is more effective in #10915.

combo/settings.py

@@ -142,6 +142,7 @@ CKEDITOR_CONFIGS = {
                         ['RemoveFormat',],
                         ['Maximize']],
         'toolbar': 'Own',
+        'resize_enabled': False,
     },
 }