[FIX] odoo: count should be distinct in read_group for filters like '…

…unread messages' or 'activity' in both view kanban or list;

before this commit
	- apply filters like 'unread messages', 'late activity' etc with any group by then result is total number of unread messages or activity
after this commit
	- apply filters like 'unread messages', 'activity' with any group by then result should display total no of records which have unread messages or activity.

odoo/models.py

@@ -1909,7 +1909,7 @@ def _read_group_raw(self, domain, fields, groupby, offset=0, limit=None, orderby
         prefix_term = lambda prefix, term: ('%s %s' % (prefix, term)) if term else ''
 
         query = """
-            SELECT min("%(table)s".id) AS id, count("%(table)s".id) AS "%(count_field)s" %(extra_fields)s
+            SELECT min("%(table)s".id) AS id, count(DISTINCT "%(table)s".id) AS "%(count_field)s" %(extra_fields)s
             FROM %(from)s
             %(where)s
             %(groupby)s