[FIX] web: make the domain field a "block" field

The domain field needs space to be rendered. Even with its "in_dialog"
option activated, the readonly representation can take some space.
If there is not enough space, it will be a mess to read it and the
"-> x records" button can also overflow the "Add filter" button.

This commit makes the field to be rendered as a "block", which fixes
the problem in all current cases.

addons/web/static/src/less/form_view_layout.less

@@ -162,7 +162,7 @@
     }
 
     // Block fields
-    .note-editor, .oe_form_field_html, .oe_form_field_html_text, .oe_form_field_text, .o_view_manager_content {
+    .note-editor, .oe_form_field_html, .oe_form_field_html_text, .oe_form_field_text, .o_view_manager_content, .o_form_field_domain {
         display: block;
     }