[FIX] website: fix top action buttons padding

Before this commit, the padding of the top action buttons in the editor
(save, discard and undo buttons) was related to the buttons padding
options of the theme.

After this commit, the padding of those buttons doesnt change with the
theme padding value.

task-2349723

closes odoo/odoo#58993

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

addons/website/static/src/scss/website.wysiwyg.scss

@@ -36,6 +36,7 @@
     .btn {
         border: none;
         border-radius: 0;
+        padding: 0.375rem 0.75rem;
         font-size: $o-we-font-size;
         font-family: $o-we-font-family;
         font-weight: 400;