Preferences does not load the existing preference when showing screen

[Terry Burns-Dyson]

When you navigate away from preferences and return, the value resets to 0 even though the database has the value stored.

Expected Behavior; Should show the value last entered

Test;

• Navigate to Preferences, enter a value of 64
• Validate the database has a preference of 64 target fluid ounces
• Navigate to Log
• Navigate back to Preferences
• Value should show 64

[Junicus]

Looking at this, it looks like a new endpoint will be needed to get the preferences from the api, additionally the preferences page needs to be initialized from that endpoint.

[Terry Burns-Dyson]

As we added timezone offset to the preferences since this was done, we should also load this preference and display options for selecting timezone.