[FIX] web: fix can't open date picker on graph views

Issue

	- Install CRM
	- CRM > Reports > Activities
	- Add a custom filter > Created on
	- Select the date

	You can't, the date picker is not shown

Cause

	Actually, the date picker is shown but
	very quickly and it is closed by a scroll
	event thrown by Chart.js.

Solution

	Close the date picker only if the user
	scrolls manually.

OPW-2245019

closes odoo/odoo#50434

Signed-off-by: Jason Van Malder (jvm) <jvm@odoo.com>