Remove core blocks patches from composer.json

Agree that those patches do not hurt for now, but it could lead to unexpected behaviors in other contexts.

Given that those patches were created for the default dashboard, they could be added to the drupal_cms composer.json file if actually needed.

Checked the dashboard demo github repo, where the patches were used, but added to the project's main composer.json file, so this change should not affect it either.

MR created.

Thanks, Pablo!

Automatically closed - issue fixed for 2 weeks with no activity.