Hitting "Enter" when searching a MongoDB-type lookup table data adapter's entries saves data adapter config

## Expected Behavior

When searching a MongoDB-type lookup table data adapter's entries via the search input in the `Configured keys and values` section, hitting `Enter` after typing a query should not trigger a save of the data adapter's configuration.

## Current Behavior

When searching a MongoDB-type lookup table data adapter's entries via the search input in the `Configured keys and values` section, hitting `Enter` after typing a query triggers a save of the data adapter's configuration.

## Steps to Reproduce (for bugs)

1. Have a MongoDB-type lookup table data adapter
2. Navigate to the data adapter's edit page (`/system/lookuptables/data_adapter/$NAME/edit`)
3. Click in the `Configured keys and values` section's `Enter search query...` input and hit `Enter`
4. Note the data adapter config saves and you get redirected to the `Data Adapters for Lookup Tables` (`/system/lookuptables/data_adapters`) page (with a `Data Adapter updated successfully` notification)

## Context

Using the `Enter` key to submit a search is common-- so even though this particular section updates the results as the query is written, a user hitting `Enter` should be handled gracefully (i.e. not result in an unexpected data adapter config save).

## Your Environment

* Graylog Version: `7.0.4`
* Browser version: Firefox `149`

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