[FIX] mrp: BoM Overview filters display

Since the pager div doesn't appear anymore in the DOM when it would be
empty, the filters buttons (warehouse and display) would be pushed back
to the end of the flex div.

Part of task-2985735

Part-of: odoo/odoo#104893

addons/mrp/static/src/components/bom_overview_control_panel/mrp_bom_overview_control_panel.xml

@@ -42,7 +42,7 @@
             </t>
 
             <t t-set-slot="control-panel-bottom-right">
-                <div class="o_cp_bottom_right_sp">
+                <div class="o_search_options">
                     <t t-if="props.warehouses.length > 1">
                         <Dropdown class="'btn-group'" togglerClass="'btn btn-secondary'">
                             <t t-set-slot="toggler">