fixed create repo page layout (#17012)

Signed-off-by: Alexey Terentyev <[email protected]>

Author: axifive

templates/repo/create.tmpl

@@ -1,6 +1,6 @@
 {{template "base/head" .}}
 <div class="page-content repository new repo">
-	<div class="ui middle very relaxed page grid">
+	<div class="ui middle very relaxed page one column grid">
 		<div class="column">
 			<form class="ui form" action="{{.Link}}" method="post">
 				{{.CsrfTokenHtml}}