[FIX] web: fix more menu

Issue

	- Install Accounting
	- Resize your window to have the more menu
	- Refresh the page to make the JS working correctly
	- Click on the item on the left of the more menu
	- Do not close the menu just hover the more menu
	=> It doesn't appears (the .show class is on the last <li> child instead of the parent)
	Click on the more menu
	=> It appears but small & with items broken

Cause

	Without the :first, all the more menu dropdown where toggled

Issue

	Add :first to the target to toggle

OPW-2178843

closes odoo/odoo#46553

X-original-commit: 55a4a834461446a070ad06d1b24d67fbc27799a1
Signed-off-by: Jason Van Malder (jvm) <jvm@odoo.com>
Co-authored-by: aab-odoo <aab@odoo.com>

addons/web/static/src/js/chrome/menu.js

@@ -226,9 +226,9 @@ var Menu = Widget.extend({
         var $target = $(ev.currentTarget);
         var $opened = $target.siblings('.show');
         if ($opened.length) {
-            $opened.find('[data-toggle="dropdown"]').dropdown('toggle');
+            $opened.find('[data-toggle="dropdown"]:first').dropdown('toggle');
             $opened.removeClass('show');
-            $target.find('[data-toggle="dropdown"]').dropdown('toggle');
+            $target.find('[data-toggle="dropdown"]:first').dropdown('toggle');
             $target.addClass('show');
         }
     },