[FIX] tools: February 28th

- Set your fiscal year end date to 28th February
- Run the P&L a year before a leap year, e.g. anytime between March 1st
  and December 31st 2019.
- Select 'Last Financial Year'

The dates are set from 2019-03-01 to 2019-02-28.

There are actually 2 bugs. The one solved here is the following
inconsistency:

```
current_date = type(date)(2019, 4, 3)
date_utils.get_fiscal_year(current_date, day=28, month=2)
'date_from': datetime.date(2019, 3, 1), 'date_to': datetime.date(2020, 2, 28)

current_date = type(date)(2020, 2, 28)
date_utils.get_fiscal_year(current_date, day=28, month=2)
{'date_from': datetime.date(2019, 3, 1), 'date_to': datetime.date(2020, 2, 29)}
```

Both should return `'date_to': datetime.date(2020, 2, 29)`. This implies
that the period is recognized as `custom`, which is affected by the bug
solved in PR https://github.com/odoo/enterprise/pull/4006

opw-1949628

closes odoo/odoo#32366

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

odoo/tools/date_utils.py

@@ -73,6 +73,10 @@ def get_fiscal_year(date, day=31, month=12):
         date_from = date_to + relativedelta(days=1)
         max_day = calendar.monthrange(date_to.year + 1, date_to.month)[1]
         date_to = type(date)(date.year + 1, month, min(day, max_day))
+
+        # Force at 29 February instead of 28 in case of leap year.
+        if date_to.month == 2 and date_to.day == 28 and max_day == 29:
+            date_to += relativedelta(days=1)
     return date_from, date_to