Fix whitespace rendering in diff (#13415)

- Introduce new .code-inner class that sets the CSS attributes on
rendered code lines like view,blame and diff.
- Rename .wrap class to .word-break to reflect what it actually does
- Remove .raw which was only used on webhook page
- Set white-space: pre-wrap except on blame where it can break the
layout

Fixes: https://github.com/go-gitea/gitea/issues/13406

templates/repo/view_file.tmpl

@@ -99,7 +99,7 @@
 								<span id="L{{$line}}" data-line-number="{{$line}}"></span>
 							</td>
 							<td rel="L{{$line}}" class="lines-code chroma">
-								<code>{{$code | Safe}}</code>
+								<code class="code-inner">{{$code | Safe}}</code>
 							</td>
 						</tr>
 						{{end}}