Updated GhostBSD boot splash

[ericbsd]

Summary by Sourcery

Bug Fixes:

• Replace default boot splash image with GhostBSD branding in loader.conf

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the boot loader configuration to use GhostBSD’s branded splash image instead of the default FreeBSD logo.

File-Level Changes

Change	Details	Files
Replaced default FreeBSD splash image with GhostBSD brand image	Updated the 'splash' setting in loader.conf to point to ghostbsd-brand.png instead of freebsd-logo-rev.png	stand/defaults/loader.conf

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[github-actions]

Thank you for taking the time to contribute to FreeBSD!
There is an issue that needs to be fixed:

• Missing Signed-off-by lines^9f837a9

Please review CONTRIBUTING.md, then update and push your branch again.