RC1: Message Table can be switched to Log View but not otherway arround

## Expected Behavior

As a message table can be switched to a Log View (Enterprise) one would asume that this can be reversed.
As the wording is 'switching' it assumes that it can be reversed.
## Current Behavior

It seams to be a onetime option to convert(?) the message table to a Log View Widget.

## Possible Solution

Allow switching from logview widget to message table

## Steps to Reproduce (for bugs)

1. Open Search -> Message Table -> Convert to Log View
2. Message Table gets switched
3. Log View can not be switched to Message Table
4.

## Context

As a normal user one would assume as it says 'switch' that this can be reverted or switchted back. In the current state its a oneway transformation.

## Your Environment

* Graylog Version: 4.1.0 RC1
* Java Version:
* Elasticsearch Version:
* MongoDB Version:
* Operating System:
* Browser version: