[IMP] calendar: place smartbutton within oe_button_box
[IMP] calendar: place smartbutton within oe_button_box

closes odoo/odoo#37987

Signed-off-by: Aaron Bohy (aab) <40b904fd8852297daeaeb426b1bca46fd2454aa3@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo