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/blame.tmpl

@@ -26,7 +26,7 @@
 					<tr>
 						<td class="lines-commit">{{.BlameCommitInfo}}</td>
 						<td class="lines-num">{{.BlameLineNums}}</td>
-						<td class="lines-code"><pre><code class="chroma"><ol class="linenums">{{.BlameContent}}</ol></code></pre></td>
+						<td class="lines-code"><code class="chroma"><ol class="linenums">{{.BlameContent}}</ol></code></td>
 					</tr>
 				</tbody>
 			</table>