[FIX] web_editor: content under top bar in iframe

In ff81fa479 there was some refactoring for change of structure on
frontend, but for the iframe editor (eg. mass mailing), this caused that
the top edition bar was over the content.

opw-2426400

closes odoo/odoo#66099

X-original-commit: d4a2e6cda246b498f604ac5765a5ef5d0041a577
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/web_editor/static/src/scss/wysiwyg_iframe.scss

@@ -17,6 +17,10 @@ iframe.wysiwyg_iframe.o_fullscreen {
 body.o_in_iframe {
     background-color: $o-view-background-color;
 
+    &.editor_enable {
+        padding-top: var(--o-we-toolbar-height) !important;
+    }
+
     .note-statusbar {
         display: none;
     }