Remove dupelicate link (#4100)

templates/base/head.tmpl

@@ -141,7 +141,7 @@
 			<div class="ui top secondary stackable main menu following bar light">
 				<div class="ui container" id="navbar">
 					<div class="item brand" style="justify-content: space-between;">
-						<a href="{{AppSubUrl}}/" href="{{AppSubUrl}}/">
+						<a href="{{AppSubUrl}}/">
 							<img class="ui mini image" src="{{AppSubUrl}}/img/gitea-sm.png">
 						</a>
 						<div class="ui basic icon button mobile-only" id="navbar-expand-toggle">