Remove incorrect HTML self close tag (#23748)

HTML is not XML.

templates/repo/issue/labels/edit_delete_label.tmpl

@@ -28,7 +28,7 @@
 					<input class="label-exclusive-input" name="exclusive" type="checkbox">
 					<label>{{.locale.Tr "repo.issues.label_exclusive"}}</label>
 				</div>
-				<br/>
+				<br>
 				<small class="desc">{{.locale.Tr "repo.issues.label_exclusive_desc" | Safe}}</small>
 				<div class="desc gt-ml-2 gt-mt-3 gt-hidden label-exclusive-warning">
 					{{svg "octicon-alert"}} {{.locale.Tr "repo.issues.label_exclusive_warning" | Safe}}

templates/repo/issue/labels/label_load_template.tmpl

@@ -2,7 +2,7 @@
 	<div class="twelve wide computer column">
 		<div class="ui attached left aligned segment">
 			<p>{{.locale.Tr "repo.issues.label_templates.info"}}</p>
-			<br/>
+			<br>
 			<form class="ui form center" action="{{.Link}}/initialize" method="post">
 				{{.CsrfTokenHtml}}
 				<div class="field">
@@ -11,7 +11,7 @@
 						<div class="default text">{{.locale.Tr "repo.issues.label_templates.helper"}}</div>
 						<div class="menu">
 							{{range $template, $labels := .LabelTemplates}}
-								<div class="item" data-value="{{$template}}">{{$template}}<br/><i>({{$labels}})</i></div>
+								<div class="item" data-value="{{$template}}">{{$template}}<br><i>({{$labels}})</i></div>
 							{{end}}
 						</div>
 						{{svg "octicon-triangle-down" 18 "dropdown icon"}}

templates/repo/issue/labels/label_new.tmpl

@@ -16,7 +16,7 @@
 					<input class="label-exclusive-input" name="exclusive" type="checkbox">
 					<label>{{.locale.Tr "repo.issues.label_exclusive"}}</label>
 				</div>
-				<br/>
+				<br>
 				<small class="desc">{{.locale.Tr "repo.issues.label_exclusive_desc" | Safe}}</small>
 			</div>
 			<div class="field">