When date is changed before daylight savings, time does not update to be standard time

### I'm Submitting a ...

```
[ x ] Bug report
[ ] Feature request
[ x ] Support request
```

### Steps to Reproduce

- Using version 4.8.0
- Use momentTimeZone do
```
import momentTimezone from "moment-timezone/moment-timezone";
momentTimezone.tz.add("America/Los_Angeles|PST PDT|80 70|0101|1Lzm0 1zb0 Op0");
```
- load the calendar
```

```

- When you change the date on the calendar from a date in daylight savings to one not in daylight savings the calendar wont use the PST time zone over the PDT time zone

### Expected Results

Going from PDT dates to PST dates are respected

### Actual Results

They are not, the time picker stays in PDT

### Minimal Reproduction of the Problem

See above

### Other Information (e.g. stacktraces, related issues, suggestions how to fix)