[FIX] web: remove unnecessary classes from Notebook

This commit removes the 'bg-white' and 'pt-3' classes used in
the Notebook template since commit https://github.com/odoo/odoo/commit/68f1c90a031a7c2f751d9c8eca7ff525e9f7e206.
Now that the component is used by other components, such as the
media dialog from web_editor, it is not appropriate to add such
style in the core component.

Also, removing the bg-white class has no concrete effect in form
views, so it can be removed safely.

closes odoo/odoo#100253

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/web/static/src/core/notebook/notebook.scss

@@ -1,7 +1,7 @@
 .o_notebook {
     --notebook-margin-x: 0;
     --notebook-padding-x: 0;
-    --notebook-link-border-color: transparent; 
+    --notebook-link-border-color: transparent;
     --notebook-link-border-color-active: #{$border-color};
     --notebook-link-border-color-hover: #{$gray-200};
     --notebook-link-border-color-active-accent: #{$border-color};
@@ -18,7 +18,7 @@
     .nav-item {
         white-space: nowrap;
     }
-    
+
     .nav-link {
         border: 1px solid var(--notebook-link-border-color, transparent);
 
@@ -47,7 +47,7 @@
             width: max-content;
             border-bottom: 1px solid var(--notebook-link-border-color);
         }
-        
+
         .nav-item {
             margin: 0 -1px -1px 0;
 
@@ -55,7 +55,7 @@
                 border-top-width: 0;
             }
         }
-        
+
         .nav-link {
             border: 1px solid var(--notebook-link-border-color, transparent);
 

addons/web/static/src/core/notebook/notebook.xml

@@ -10,7 +10,7 @@
                     </li>
                 </ul>
             </div>
-            <div class="o_notebook_content bg-white pt-3 tab-content">
+            <div class="o_notebook_content tab-content">
                 <div class="tab-pane active" t-ref="activePane">
                     <t t-if="page" t-component="page.Component" t-key="state.currentPage" t-props="page.props" />
                     <t t-else="" t-slot="{{ state.currentPage }}" />