[FIX] hr_holidays: remove unread meassages filter
[FIX] hr_holidays: remove unread meassages filter

Before the models split in a0f4f65 the Leaves Summary report inherited
the message_needaction from mail.thread.  Now the hr.leave.report model
does not have this field and leads to a traceback.

With this commit, the filter is removed from the search view of the
report.

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