Extended monthdays: remove ascending requirement

The (unofficial) grammar says nothing about the order of the
monthdays.

autotests/parsertest.cpp

@@ -231,6 +231,8 @@ private Q_SLOTS:
         T2("december", "Dec");
         T2("Dec 24,25,26, Jan 1,6 off", "Dec 24,25,26,Jan 01,06 off");
         T2("Dec 24,25,26 open, Jan 1,6 off", "Dec 24,25,26 open, Jan 01,06 off");
+        T2("Dec 6,4", "Dec 06,04");
+        T2("Dec 3,2,1", "Dec 03,02,01");
         T2("07:30-20:00; Jan 03, 13, 23, Feb 03, 13, 23, Mar 03, 13, 23, Apr 03, 13, 23, Jun 03, 13, 23, Jul 03, 13, 23, Aug 03, 13, 23, Sep 03, 13, 23, Oct 03, 13, 23, Nov 03, 13, 23, Dec 03, 13, 23 off",
            "07:30-20:00; Jan 03,13,23,Feb 03,13,23,Mar 03,13,23,Apr 03,13,23,Jun 03,13,23,Jul 03,13,23,Aug 03,13,23,Sep 03,13,23,Oct 03,13,23,Nov 03,13,23,Dec 03,13,23 off");
         T2("Apr, May, Oct, Nov, Dec: Mo-Su, 10:00-19:00; Jun-Sep: Mo-Su:10:00-20:00", "Apr,May,Oct,Nov,Dec: Mo-Su, 10:00-19:00; Jun-Sep: Mo-Su 10:00-20:00");
@@ -434,9 +436,7 @@ private Q_SLOTS:
         T("12:61");
         T("60p");
 
-        T("Dec 6,4");
         T("Dec 24-Jan 1,6");
-        T("Dec 3,2,1");
         T("Mo, 1:100");
 
         // from https://wiki.openstreetmap.org/wiki/Key:opening_hours#Common_mistakes

src/lib/openinghoursparser.y

@@ -47,9 +47,7 @@ static bool extendMonthdaySelector(MonthdayRange *monthdaySelector, int beginDay
 {
     const auto prevSelector = lastSelector(monthdaySelector);
     if (prevSelector->begin.year == prevSelector->end.year
-     && prevSelector->begin.month == prevSelector->end.month
-     && prevSelector->begin.day < day
-     && prevSelector->end.day < day)
+     && prevSelector->begin.month == prevSelector->end.month)
     {
         auto sel = new MonthdayRange;
         sel->begin = sel->end = prevSelector->end;