[FIX] web: center o_cp_action_menus div

Since commit a1f286916d o_cp_action_menus is not centered
anymore as justify-content: space-between; was removed from scss.

with this commit we are making o_cp_action_menus centered again.

task-2628050

X-original-commit: 590d0ca81382d4c3d6007bdf9bf65ed3a0ed795e
Part-of: odoo/odoo#77649

addons/web/static/src/search/control_panel/control_panel.scss

@@ -33,6 +33,7 @@
         display: flex;
         flex-wrap: wrap;
         gap: map-get($spacers, 3) map-get($spacers, 2);
+        justify-content: space-between;
 
         > .o_cp_action_menus {
             padding-right: 10px;