Revert increased width on pull pages

- Revert a behavior from go-gitea#21012, which liberally added `fluid padded` to
non-split style pull pages, this caused it to take up the whole
screen(such in split-style pull pages) on pull pages where the diff was
shown.
- Resolves go-gitea#21460

templates/repo/commit_page.tmpl

@@ -1,7 +1,7 @@
 {{template "base/head" .}}
 <div class="page-content repository diff">
 	{{template "repo/header" .}}
-	<div class="ui container fluid padded">
+	<div class="ui container {{if .IsSplitStyle}}fluid padded{{end}}">
 		{{$class := ""}}
 		{{if .Commit.Signature}}
 			{{$class = (printf "%s%s" $class " isSigned")}}

templates/repo/diff/compare.tmpl

@@ -1,7 +1,7 @@
 {{template "base/head" .}}
 <div class="page-content repository diff {{if .PageIsComparePull}}compare pull{{end}}">
 	{{template "repo/header" .}}
-	<div class="ui container fluid padded">
+	<div class="ui container {{if .IsSplitStyle}}fluid padded{{end}}">
 
 	<h2 class="ui header">
 		{{if and $.PageIsComparePull $.IsSigned (not .Repository.IsArchived)}}

templates/repo/pulls/files.tmpl

@@ -5,7 +5,7 @@
 
 <div class="page-content repository view issue pull files diff">
 	{{template "repo/header" .}}
-	<div class="ui container fluid padded">
+	<div class="ui container {{if .IsSplitStyle}}fluid padded{{end}}">
 		<div class="navbar">
 			{{template "repo/issue/navbar" .}}
 			<div class="ui right">