refactor: Rename formatPastDate into defaultFormatting for a more precision namming

The method does format future dates in a specific way so it can't be called "formatPastDate"

Author: LunarX

app/src/main/java/com/infomaniak/mail/ui/main/folder/DateDisplay.kt

@@ -33,7 +33,7 @@ import java.util.Date
 enum class DateDisplay(@DrawableRes val icon: Int?, val formatDate: Context.(RealmInstant) -> String) {
     Default(
         icon = null,
-        formatDate = { date -> formatPastDate(date) }
+        formatDate = { date -> defaultFormatting(date) }
     ),
     Scheduled(
         icon = R.drawable.ic_scheduled_messages,
@@ -49,7 +49,7 @@ private fun Context.formatRelativeFutureDate(date: RealmInstant) = DateUtils.get
     DateUtils.FORMAT_SHOW_YEAR or DateUtils.FORMAT_ABBREV_MONTH,
 )?.toString() ?: ""
 
-private fun Context.formatPastDate(date: RealmInstant) = with(date.toDate()) {
+private fun Context.defaultFormatting(date: RealmInstant) = with(date.toDate()) {
     when {
         isInTheFuture() -> formatNumericalDayMonthYear()
         isToday() -> format(FORMAT_DATE_HOUR_MINUTE)