The "Custom data" field in "Send web request" cannot be edited

Issue Summary

When accessing the "Send web request" action and selecting the "Webhook body" as "Custom data", the "Custom data" field remains greyed-out and cannot be edited

Steps to Reproduce

1. Access the automation rules page in the project settings
2. Click on Create rule (or edit an existing one that has the "Send web request" action)
3. Add a trigger to the rule (you can choose any)
4. Add an action Send web request to the rule
5. In the Webhook body field, select the option Custom data

Expected Results

You can add custom data to the field and use it as the payload for the request

Actual Results

The field is greyed-out

Workaround

You can use the browser inspector do make the field editable, as described below:

1. Right-click on the field and chose the option Inspect
2. In the element as described below, remove the disabled clause and hit the "Enter" key on your keyboard.

<textarea rows="10" class="textarea long-field long-field" name="customBody" id="customBody" disabled=""></textarea>