Fix getIndexForDaySmartSymbol() function

[geosaaga]

The function

weather-app/src/utils/helpers.ts

Line 385 in a946675

export const getIndexForDaySmartSymbol = (dayArray: TimeStepData[]): number => {

doesn't work for the last day of forecast. It returns quite random symbol depending how long the forecast is. The issue is visible especially during winter time, because it may return day symbol instead of night symbol when sun sets early.

The function should be fixed to use local time instead of handling indexes.