🐞 Vote Totals Might be Incorrect on Admin Display

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When creating a viewing a tally, the total number of ballots is used to determine the percentage that each candidate gets and is also used to calculate the undervotes. This could lead to a higher number of total ballots being reported for that contest and have lower percentages being displayed.

### Expected Behavior

The number of ballots that need to be used is the number of ballots that use the ballot style that contains the contest being calculated for.

### Steps To Reproduce

_No response_

### Environment

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### Anything else?

_No response_