DtD form settings should be hidden until Enabled

[mathetos]

User Story

As a GiveWP form creator, I don't want to see "Company Matching" fields unless I've Enabled Company Matching on my form.

Details

Currently the "Default Label" field is shown whether the feature is enabled on the form or not.

Expected Behavior

The "Default Label" field should not appear on the form until the feature is enabled.

Steps to Reproduce

1. ACtivate the add-on
2. Add the test API keys
3. Go to edit an existing form and click on the "Company Matching" tab
4. You'll see the "Default Label" field appears though the feature is set to "Disabled"

Visuals

Acceptance Criteria

• [x] The "Default Label" field is hidden by default when the default setting for the feature is set to "Disabled"
• [x] Changing the setting from "Enabled" to "Disabled" shows/hides the field correctly
• [x] After saving the form, the setting still is shown/hidden correctly based on whether the feature is enabled or not