[FIX] odoo_theme: fix header display on small screen widths

The highlight-link was pushing the header height to be on two lines.
It is now absolutely positioned below the searchbar instead of to its right.
The switchers now push themselves to the right instead of being pushed by the searchbar-wrapper.

extensions/odoo_theme/layout_templates/searchbox.html

@@ -1,5 +1,5 @@
 {# NOTE: the 'searchbox' id is used to hook the "Hide Search Matches" button #}
-<div id="searchbox" class="o_search_wrapper flex-grow-1 pe-lg-2" role="search">
+<div id="searchbox" class="o_search_wrapper pe-lg-2" role="search">
     <form class="o_search" action="{{ pathto('search') }}" method="get">
         <input type="text" name="q" id="q" class="form-control rounded-pill" placeholder="What are you looking for?">
         <input type="hidden" name="area" value="default">