Correct DeviceStatus Download Count and Dynamic BGData Download Limit

[bjorkert]

1. DeviceStatus.swift:
• Corrected the count parameter for device status downloads from 288 to 1, as only one record is needed. The initial value was a copy-paste error, which led to unnecessary data being downloaded.
2. BGData.swift:
• Adjusted the count parameter to dynamically calculate the limit of BG values to download. The new formula accounts for both Loop/Trio and Dexcom Share data, leading to 2 * 288 BG values per day.
• Previous hardcoded value: 1000. Two days of double data results in 1152 values.
• New dynamic value: UserDefaultsRepository.downloadDays.value * 2 * 24 * 60 / 5

[marionbarker]

The code review looks good.
Tested and it works.
Used Trio and Loop NS sources and increased display days to 4. All data is displayed.

Future question:
Q: Do we need to future proof this for a 1-minute CGM update rate?
A: Not at this time and it would be a separate PR.