After commit odoo/enterprise@8a38a60b1f mobile tests didn't run correctly because of missing viewport META in HEAD. This commit add the missing META. This META must be before all JavaScript file to ensure that JavaScript also know that we work in a viewport. Note that "runbot" run tests in a chromium headless with a size screen reduced and so it worked without this fix. closes odoo/odoo#41183 Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>