[FIX] web: add tests for calendar start of the week and week numbering
[FIX] web: add tests for calendar start of the week and week numbering

The week_start has been added as an option since commit 27b30daea54b02c.
This stores as a database parameter the day starting the week, [1.. 7] starting
on Monday, while the calendar options expect to get Sunday as 7 % 7 = 0.
As a result the week number would be shifted.

Commit c72403d2ba79f0d5091183e33240034f2fdc6f73 solved the issue,
this commit adds tests for it.

opw 1916666

closes odoo/odoo#29838
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo