Add default value for RangeSlider in StatView

Set `RangeSlider` values to min and max upon initial load

The app was doing this before anyway, it was just not displaying it on the slider

app/src/pages/StatView.tsx

@@ -82,6 +82,7 @@ const StatView = () => {
                 min={0}
                 max={getDaysBetween(firstStreamDate, lastStreamDate)}
                 step={1}
+				defaultValue={[0, getDaysBetween(firstStreamDate, lastStreamDate)]} // This bad boy right here
                 onInput={(value) => {
                     const startDate = getDaysAfter(firstStreamDate, value[0]);
                     const endDate = getDaysAfter(firstStreamDate, value[1]);