Days not lining up correctly after changing DayButton size

"react-native-calendar": "https://github.com/christopherdro/react-native-calendar"

Changed calendar width to 0.7 of screen and dayButton to 1/7 of that. The top row is jutting out...

iOS

Android

```
calendarContainer: {
width: calendarWidth
},
dayButton: {
width: calendarWidth/7
}
```

Reproduce the layout on iOS and Android using the reported calendar width and inspect the calendarContainer and dayButton styles shown in the issue. Compare the rendered top row with the remaining days to identify why the widths do not align; done means the rows line up consistently on both platforms.

Written by the indexing model from the issue text.