Fix dropdown menu position on explore repo (#2808)

Signed-off-by: Mulia Arifandi Nasution <mul14.net@gmail.com>

templates/explore/search.tmpl

@@ -1,6 +1,6 @@
 <div class="ui right floated secondary filter menu">
 <!-- Sort -->
-	<div class="ui dropdown type jump item">
+	<div class="ui right dropdown type jump item">
 		<span class="text">
 			{{.i18n.Tr "repo.issues.filter_sort"}}
 			<i class="dropdown icon"></i>