Fix issue/mr close/reopen via API

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/services/issues/update_service.rb

 module Issues
   class UpdateService < Issues::BaseService
     def execute(issue)
-      state = params.delete('state_event')
+      state = params.delete('state_event') || params.delete(:state_event)
 
       case state
       when 'reopen'

app/services/merge_requests/update_service.rb

@@ -10,7 +10,7 @@ module MergeRequests
       params.delete(:source_project_id)
       params.delete(:target_project_id)
 
-      state = params.delete('state_event')
+      state = params.delete('state_event') || params.delete(:state_event)
 
       case state
       when 'reopen'