Do not disable commit changes button on repost (#12644)

If the user has pressed commit changes and the post has failed - do not disable
the commit changes button.

Fix #12072

Signed-off-by: Andrew Thornton <art27@cantab.net>

templates/repo/editor/edit.tmpl

@@ -6,6 +6,7 @@
 		<form class="ui edit form" method="post">
 			{{.CsrfTokenHtml}}
 			<input type="hidden" name="last_commit" value="{{.last_commit}}">
+			<input type="hidden" name="page_has_posted" value="{{.PageHasPosted}}">
 			<div class="ui secondary menu">
 				<div class="fitted item treepath">
 					<div class="ui breadcrumb field {{if .Err_TreePath}}error{{end}}">