perf: increased default step to 12 months (a year) so that less infinite scroll is required to traverse months for the given year.
perf: increased default step to 12 months (a year) so that less infinite scroll is required to traverse months for the given year.

EbilPanda/ion2-calendar,HsuanXyz/ion2-calendar,HsuanXyz/ion2-calendar,HsuanXyz/ion2-calendar,EbilPanda/ion2-calendar