Add api_key to filtered variables.

We don't use it yet, but the plan is the migrate there and it's better
to just have the filtering in place.

(imported from commit d0e7f40e8a439b8e8751da954e79b5f67226e5a9)

zerver/filters.py

@@ -7,7 +7,7 @@ class ZulipExceptionReporterFilter(SafeExceptionReporterFilter):
     def get_post_parameters(self, request):
         filtered_post = SafeExceptionReporterFilter.get_post_parameters(self, request).copy()
         filtered_vars = ['content', 'secret', 'password', 'key', 'api-key', 'subject', 'stream',
-                         'subscriptions', 'to', 'csrfmiddlewaretoken']
+                         'subscriptions', 'to', 'csrfmiddlewaretoken', 'api_key']
 
         for var in filtered_vars:
             if var in filtered_post: