Fix incorrect redirection when creating a PR fails (#29537) (#29543)

Backport #29537 by wxiaoguang

This is only a quick fix to make it easier to backport.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/repo/diff/compare.tmpl

@@ -11,14 +11,6 @@
 			{{ctx.Locale.Tr "action.compare_commits_general"}}
 		{{end}}
 	</h2>
-	{{if .Flash.WarningMsg}}
-		{{/*
-			There's already an importing of alert.tmpl in new_form.tmpl,
-			but only the negative message will be displayed within forms for some reasons, see semantic.css:10659.
-			To avoid repeated negative messages, the importing here if for .Flash.WarningMsg only.
-		*/}}
-		{{template "base/alert" .}}
-	{{end}}
 	{{$BaseCompareName := $.BaseName -}}
 	{{- $HeadCompareName := $.HeadRepo.OwnerName -}}
 	{{- if and (eq $.BaseName $.HeadRepo.OwnerName) (ne $.Repository.Name $.HeadRepo.Name) -}}

templates/repo/issue/new.tmpl

@@ -2,14 +2,6 @@
 <div role="main" aria-label="{{.Title}}" class="page-content repository new issue">
 	{{template "repo/header" .}}
 	<div class="ui container">
-		{{if .Flash.WarningMsg}}
-			{{/*
-			There's already an importing of alert.tmpl in new_form.tmpl,
-			but only the negative message will be displayed within forms for some reasons, see semantic.css:10659.
-			To avoid repeated negative messages, the importing here if for .Flash.WarningMsg only.
-			 */}}
-			{{template "base/alert" .}}
-		{{end}}
 		{{template "repo/issue/new_form" .}}
 	</div>
 </div>

templates/repo/issue/new_form.tmpl

@@ -1,10 +1,8 @@
+{{if .Flash}}
+{{template "base/alert" .}}
+{{end}}
 <form class="issue-content ui comment form form-fetch-action" id="new-issue" action="{{.Link}}" method="post">
 	{{.CsrfTokenHtml}}
-	{{if .Flash}}
-		<div class="sixteen wide column">
-			{{template "base/alert" .}}
-		</div>
-	{{end}}
 	<div class="issue-content-left">
 		<div class="ui comments">
 			<div class="comment">