[FIX] point_of_sale: adapt webclient template

according to changes in web.

Some changes have been made to the webclient template (and widget)
in web, and the pos (using the webclient widget as well) needed to
be adapted.

Part of task 1893568

addons/point_of_sale/static/src/js/tests.js

@@ -50,7 +50,7 @@ odoo.define('point_of_sale.tour.pricelist', function (require) {
         run: 'click',
     }, {
         content: 'waiting for loading to finish',
-        trigger: '.o_main_content:has(.loader:hidden)',
+        trigger: 'body:has(.loader:hidden)',
         run: function () {
             var product_wall_shelf = posmodel.db.search_product_in_category(0, 'Wall Shelf Unit')[0];
             var product_small_shelf = posmodel.db.search_product_in_category(0, 'Small Shelf')[0];
@@ -312,7 +312,7 @@ odoo.define('point_of_sale.tour.acceptance', function (require) {
 
     var steps = [{
             content: 'waiting for loading to finish',
-            trigger: '.o_main_content:has(.loader:hidden)',
+            trigger: 'body:has(.loader:hidden)',
             run: function () {}, // it's a check
         }, { // Leave category displayed by default
             content: "click category switch",

addons/point_of_sale/views/pos_templates.xml

@@ -55,7 +55,6 @@
         </script>
     </head>
     <body>
-        <div class="o_main_content"/>
     </body>
 </html>
 </template>