fix(ui): add disabled attribute to blocks drawer toggler

[rilrom]

What?

When update access control is set to false, the blocks drawer can still be accessed. Blocks still cannot be saved to the document, making this more of a QoL improvement.

Why?

The blocks DrawerToggler is missing the disabled attribute.

How?

Adding the disabled attribute to the blocks DrawerToggler.

Reproduction steps

https://github.com/rilrom/payload/tree/issue/disabled-add-block-button

1. Navigate to the posts collection.
2. Click the 'Add blocks' button.
3. Blocks can be selected (however they are still readonly in the document and cannot be saved).

Recordings

Before

before.mp4

After

after.mp4

[AlessioGr]

Thank you!

[github-actions]

🚀 This is included in version v3.1.0