[FIX] web_editor: ol in ol have first number hidden

In the case of an <ol> in an <ol> we would have something like:

1.
2. 1.
   2.
3.

With this changeset we get back what we had in 12.0:

1.
   1.
   2.
3.

which is not perfect but the same as 12.0 version.

opw-2073751
closes #37163

closes odoo/odoo#37706

X-original-commit: 479db16fdb86c6925a7f94a24f2821f3a5c047b5
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/web_editor/static/src/scss/web_editor.common.scss

@@ -81,7 +81,7 @@ ul.o_checklist {
         }
     }
 }
-ul > li.o_indent {
+ol > li.o_indent, ul > li.o_indent {
     margin-left: 0;
     list-style: none;
     &::before {