[FIX] b_shift: Next Countdown compute

This fixes the computation of the next countdown date.

beesdoo_shift/__openerp__.py

@@ -13,7 +13,7 @@
     'website': "https://github.com/beescoop/Obeesdoo",
 
     'category': 'Cooperative management',
-    'version': '9.0.1.1.0',
+    'version': '9.0.1.1.1',
 
     'depends': ['beesdoo_base'],
 

beesdoo_shift/models/cooperative_status.py

@@ -208,7 +208,7 @@ class CooperativeStatus(models.Model):
         today_dt = fields.Date.from_string(today)
         irregular_start_dt = fields.Date.from_string(irregular_start_date)
         delta = (today_dt - irregular_start_dt).days
-        return add_days_delta(today, delta % PERIOD)
+        return add_days_delta(today, PERIOD - (delta % PERIOD))
 
     def _set_regular_status(self, grace_delay, alert_delay):
         self.ensure_one()