Add fc-event-past class to day grid view

[Chloey61]

Reduced Test Case

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Bug Description

Month view, wrong class name of the day before today;
don't have '.fc-event-past'!

Screenshots

<td class="fc-daygrid-day fc-day fc-day-wed fc-day-past" data-date="2021-01-27"><div class="fc-daygrid-day-frame fc-scrollgrid-sync-inner"><div class="fc-daygrid-day-top"><a class="fc-daygrid-day-number">27日</a></div><div class="fc-daygrid-day-events" style=""><div class="fc-daygrid-event-harness"><a class="fc-daygrid-event fc-daygrid-block-event fc-h-event fc-event fc-event-draggable fc-event-resizable fc-event-start fc-event-end" style="border-color: rgb(228, 231, 237);"><div class="fc-event-main"><span><b></b><i>111</i></span></div><div class="fc-event-resizer fc-event-resizer-end"></div></a></div><div class="fc-daygrid-day-bottom"><a class="fc-daygrid-more-link">+1 more</a></div></div><div class="fc-daygrid-day-bg"></div></div></td>

[acerix]

Would you be able to post a runnable, stripped-down demonstration of the bug? Would really appreciate it because the time saved reproducing will be time spent fixing.

[camsteffen]

@acerix Ran into this today. Here is a reproduction: https://codesandbox.io/s/list-past-yesterday-bug-fh21p8

[arshaw]

Fixed in v6.1.11