don't set rdrInRange on passive days when no other days in the month belong to selection

[cmawhorter]

I'm trying to add rounding to only the start and end edge of the range, which works great:

and if the range spans multiple months, i render a muted range selection:

that works too -- unless the range is near the month edge. in that case i end up with orphan days:

maybe rdrInRange (etc.) should not be added to the passive days if no other days in that month belong to that range?

my workaround is to hide passive days, but i much prefer showing them:

Environment

Package Version: 1.4.0 React version: 16.14.0 Node version: 14.16.0 Browser: chrome