fix(comments): Use proper icon components instead of icon classes to fix dark mode

[susnux]

Summary

When using the comments app with dark mode the icons are hard to see because they are all black.
This is fixed with using proper icon components.

Screenshots

before	after

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)

[susnux]

/backport to stable29

[susnux]

/backport to stable28

[susnux]

/compile

[skjnldsv]

Awesome!!

[solracsf]

@skjnldsv@susnux should this be re-backported to stable28 ?
Ref: #45881 and #45881 (comment)

[susnux]

/backport to stable28

[skjnldsv]

/backport to stable28

[backportbot]

The backport to stable28 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable28
git pull origin stable28
# Create the new backport branch
git checkout -b backport/45867/stable28
# Cherry pick the change from the commit sha1 of the change against the default branch# This might cause conflicts, resolve them
git cherry-pick 93650e08 f8095023
# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/45867/stable28

Error: Failed to create pull request: Validation Failed: {"resource":"PullRequest","code":"custom","message":"A pull request already exists for nextcloud:backport/45867/stable28."}

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