Make diff view full width again (#24598)

Regression of #24459 , [the related
line](https://github.com/go-gitea/gitea/pull/24459/files#diff-f255004de8d715ff40852710390429bf2a06e7e33a4e3f8ad568af636557ac71L8)

The PR file diff view needs to be full-screen width.

templates/repo/pulls/files.tmpl

@@ -5,7 +5,7 @@
 
 <div role="main" aria-label="{{.Title}}" class="page-content repository view issue pull files diff">
 	{{template "repo/header" .}}
-	<div class="ui container">
+	<div class="ui container fluid padded">
 		{{template "repo/issue/view_title" .}}
 		{{template "repo/pulls/tab_menu" .}}
 		{{template "repo/diff/box" .}}