Fix tab index on new issue/comment form

templates/repo/issue/new_form.tmpl

@@ -17,7 +17,7 @@
 					</div>
 					{{template "repo/issue/comment_tab" .}}
 					<div class="text right">
-						<button class="ui green button">
+						<button class="ui green button" tabindex="6">
 							{{if .PageIsComparePull}}
 								{{.i18n.Tr "repo.pulls.create"}}
 							{{else}}