Fix: the "Offline donations" section in the controls of the Payment Gateways block should be visible when Offline gateway for v3 forms is enabled

[glaubersilva]

Resolves GIVE-1106

Description

The problem was happening because we were checking if the offline gateway for v2 forms was enabled instead of checking the offline gateway for v3 forms.

Now we changed it to check the v3 version and the problem is not happening anymore.

Affects

The Payment Gateways block.

Visuals

Testing Instructions

1. Disable the offline gateway for v2 forms;
2. Enable the offline gateway for v3 forms;
3. Go to the form builder and make sure the "Offline donations" section is visible in the controls of the Payment Gateways block settings.

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Relevant @unreleased tags included in DocBlocks
• Includes unit tests
• Reviewed by the designer (if follows a design)
• Self Review of code and UX completed

[kjohnson]

Simple enough. Looks good to me.

[rickalday]

Passed manual QA tests.