Clean up various avatar dimensions (#24701)

Clean up a few cases where avatar dimensions were overwritten via CSS,
which were no longer needed or were possible to set via HTML width.

Also included are two small fixes:

- Fix one more case of incorrect avatar offset on review timeline
- Vertically center avatars in review sidebar

There is more to be done here, but some of the work depends on Fomantic
`comment` module removal, or in the case of org member lists, a refactor
of the `avatarlink` template to accept a size.

<img width="371" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/9c5902fb-2b89-4a7d-a152-60e74c3b2c56">
<img width="306" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/c8d92e2a-91c9-4f4a-a7de-6ae1a6bc0479">

---------

Co-authored-by: Giteabot <teabot@gitea.io>

templates/repo/commits_list_small.tmpl

@@ -15,7 +15,7 @@
 
 		{{$commitLink:= printf "%s/commit/%s" $.comment.Issue.PullRequest.BaseRepo.Link (PathEscape .ID.String)}}
 
-		<span class="ui float right shabox">
+		<span class="ui float right shabox gt-df gt-ac">
 			{{template "repo/commit_statuses" dict "Status" .Status "Statuses" .Statuses "root" $.root}}
 			{{$class := "ui sha label"}}
 			{{if .Signature}}
@@ -32,7 +32,7 @@
 					{{$class = (printf "%s%s" $class " isWarning")}}
 				{{end}}
 			{{end}}
-			<a href="{{$commitLink}}" rel="nofollow" class="{{$class}}">
+			<a href="{{$commitLink}}" rel="nofollow" class="gt-ml-3 {{$class}}">
 				<span class="shortsha">{{ShortSha .ID.String}}</span>
 				{{if .Signature}}
 					{{template "repo/shabox_badge" dict "root" $.root "verification" .Verification}}