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

routers/repo/blame.go

@@ -237,6 +237,7 @@ func renderBlame(ctx *context.Context, blameParts []git.BlamePart, commitNames m
 			}
 			fileName := fmt.Sprintf("%v", ctx.Data["FileName"])
 			line = highlight.Code(fileName, line)
+			line = `<code class="code-inner">` + line + `</code>`
 			if len(part.Lines)-1 == index && len(blameParts)-1 != pi {
 				codeLines.WriteString(fmt.Sprintf(`<li class="L%d bottom-line" rel="L%d">%s</li>`, i, i, line))
 			} else {