[FIX] point_of_sale,pos_*: indeterministic tour tests failures

addons/point_of_sale/static/tests/tours/Chrome.tour.js

...ns/point_of_sale/static/tests/tours/PaymentScreen.tour.js

...ns/point_of_sale/static/tests/tours/ProductScreen.tour.js

...ns/point_of_sale/static/tests/tours/ReceiptScreen.tour.js

...sale/static/tests/tours/helpers/NumberPopupTourMethods.js

...le/static/tests/tours/helpers/PaymentScreenTourMethods.js

...le/static/tests/tours/helpers/ProductScreenTourMethods.js

addons/point_of_sale/static/tests/tours/point_of_sale.js

addons/point_of_sale/tests/test_frontend.py

addons/pos_hr/static/tests/tours/PosHrTour.js

addons/pos_hr/tests/test_frontend.py

...staurant/static/src/js/Screens/FloorScreen/FloorScreen.js

.../pos_restaurant/static/tests/tours/ControlButtons.tour.js

addons/pos_restaurant/static/tests/tours/FloorScreen.tour.js

...pos_restaurant/static/tests/tours/SplitBillScreen.tour.js

addons/pos_restaurant/tests/test_frontend.py