deleting a stream rule, make the list of rules pane to hide

- improve the user experience, cosmetic bug.
- create n number of stream rules, while deleting a stream rule, causes the entire list of rules to hide.

## Expected Behavior
do not hide the list, the rule that was deleted, must disappear and do-not hide the entire list.

## Current Behavior
deleting a stream rule, triggers hide stream rule action.

## Possible Solution

## Steps to Reproduce (for bugs)

- [ ] Stream rules can be deleted and edited using the expanded rules list

## Context

## Your Environment

* Graylog Version:
`Module versions
3.3.0-beta.3-SNAPSHOT (branch: master)`

* Elasticsearch Version:
* MongoDB Version:
* Operating System:
* Browser version:

Start by reproducing the issue in the expanded stream rules list with multiple rules, then trace the delete action and the list's visibility handling. Done means deleting one rule removes only that rule while the full list remains visible.

Written by the indexing model from the issue text.