Add icon to buttons "Close with Comment", "Close Pull Request", "Close Issue" (#36654)

Newbies often use the "Close with Comments" button instead of deleting
their comment. Icon should prevent mis-clicks.

---------

Co-authored-by: Yuriy.Khlynovskiy <yuriy.khlynovskiy@incomsystem.ru>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/repo/view_content.tmpl

@@ -116,7 +116,7 @@
 		{{end}}
 		{{if and (not $isTreePathRoot) (not .IsViewFile) (not .IsBlame)}}{{/* IsViewDirectory (not home), TODO: split the templates, avoid using "if" tricks */}}
 			<a class="ui compact button" href="{{.RepoLink}}/commits/{{.RefTypeNameSubURL}}/{{.TreePath | PathEscapeSegments}}">
-				{{svg "octicon-history" 16 "tw-mr-2"}}{{ctx.Locale.Tr "repo.file_history"}}
+				{{svg "octicon-history"}}{{ctx.Locale.Tr "repo.file_history"}}
 			</a>
 		{{end}}
 	</div>