Fix: Unreachable action buttons in notification template when using "align" prop with "left" or "right".

[lpheller]

This PR fixes an issue with the alignment of action buttons in the notification template when the align prop is used.

The option to pass align as a prop was introduced in PR #45362. When set to left or right, the action button becomes unreachable as it gets overlaid by a following text element:

(Screenshot of the PasswordReset notification rendered in Google Chrome; the issue was also reproducible in multiple mail clients.)

This occurs because applying align="left" to a table element basically adds a float: left.

Steps to reproduce:

• Set up a fresh Laravel project.
• Publish the email.blade.php file (php artisan vendor:publish --tag=laravel-notifications).
• Add align="left" to the <x-mail::button>.
• Send or render a notification (e.g., PasswordReset).

Proposed fix:
We could address this by either removing the inheritance of the align prop for the table in this line and always setting the alignment to center.

However, I propose unsetting the float for the .action class in the default theme, which feels like a less intrusive solution.