When clicking a value within a widget - message table or widget "show documents for value" is always un-clickable.

## Expected Behavior

"Show documents for value" button should open a new search page with the criteria selected; however, currently it does not in 7.0 beta 3 and 6.3.3 (maybe other versions as well) this option is always greyed out.

## Current Behavior

## Possible Solution

## Steps to Reproduce (for bugs)

1. in any widget or message table try to click on a value
2. See the option is greyed out.
3.
4.

## Context

## Your Environment

* Graylog Version: 6.3.3 / 7.0 beta 3
* Java Version:
* OpenSearch Version:
* MongoDB Version:
* Operating System:
* Browser version:

## Checklist
[] This issue fix need to be backported.
[] Does this issue have **security** implications?