Fix dropdown icon position (#27175) (#27177)

Backport #27175 by @wxiaoguang

According to https://fomantic-ui.com/modules/dropdown.html and our
"devtest" page, many dropdown elements has incorrect "icon" position.

This PR fixes all of them. Fix #27173

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/repo/commits.tmpl

@@ -7,9 +7,7 @@
 			<div class="gt-df gt-ac">
 				{{template "repo/branch_dropdown" dict "root" . "ContainerClasses" "gt-mr-2"}}
 				<a href="{{.RepoLink}}/graph" class="ui basic small compact button">
-					<span class="text">
-						{{svg "octicon-git-branch"}}
-					</span>
+					{{svg "octicon-git-branch"}}
 					{{.locale.Tr "repo.commit_graph"}}
 				</a>
 			</div>