[FIX] web_editor: link_in_selection style outside editable

Before this commit, the CSS properties defined by the
`o_link_in_selection` class could be applied to a link outside the
editable. In particular, the link preview in the LinkDialog widget would
display the visual indicator of a link in selection, even though it is
not editable nor selected (this happens because the link preview
contains the classes of the original link being edited).

As the styling provided by `.o_link_in_selection` is only meant to be
applied to links inside the editable, this commit makes sure the CSS
rule is specific about that.

task-3580546

closes odoo/odoo#146679

X-original-commit: b7664dc8e8a0a7909101f45d5a58473ca64d71ca
Signed-off-by: Nicolas Bayet (nby) <nby@odoo.com>
Signed-off-by: Rodolpho Cammarosano de Lima (rcdl) <rcdl@odoo.com>

addons/web_editor/static/src/js/editor/odoo-editor/src/style.scss

@@ -119,7 +119,7 @@
     }
 }
 
-a.o_link_in_selection:not(.btn) {
+.odoo-editor-editable a.o_link_in_selection:not(.btn) {
     background-color: #a6e3e2;
     color: black !important;
     border: 1px dashed #008f8c;