fix: added 3 new light images for facebook, bluesky and mastodon

[yemkareems]

fix: added 3 new light images for facebook, bluesky and mastodon and added them in REUSE.toml

• Resolves: #

Summary

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[susnux]

The other icons are not really "dark" icons but no color icons.
IMHO here all official logos then should be used also for e.g. X and then also directly used in the settings page.

[AndyScherzinger]

I agree with @susnux - we can just use the colored ones in both cases - also given due to the fact that i.e. facebook only allows for this specific one, no matter dark or light theming.

didn't saw the comments

[yemkareems]

Added two new images for x dark and light and switched them based on isDarkTheme flag.

[yemkareems]

Settings page also use brand images

[AndyScherzinger]

/backport to stable32

[backportbot]

The backport to stable32 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable32
git pull origin stable32

# Create the new backport branch
git checkout -b backport/55269/stable32

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 59609024 33cd89db a3e8f00f

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/55269/stable32

Error: Failed to clone repository: Failed to clone and cache repo: EACCES: permission denied, mkdir '/app/cache/nextcloud/server'

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.