Fix obtaining the current time zone on Windows

Author: dkhalanskyjb

core/windows/src/TimeZoneNative.kt

@@ -19,8 +19,8 @@ internal actual class RegionTimeZone(private val tzid: TimeZoneRules, actual ove
         }
 
         actual fun currentSystemDefault(): RegionTimeZone {
-            val zoneId = tzdbInRegistry.currentSystemDefault().second
-            return of(zoneId.toString())
+            val (name, zoneRules) = tzdbInRegistry.currentSystemDefault()
+            return RegionTimeZone(zoneRules, name)
         }
 
         actual val availableZoneIds: Set<String>
@@ -227,4 +227,4 @@ private fun offsetsAtDatetime(zone: DYNAMIC_TIME_ZONE_INFORMATION, dateTime: Loc
 private enum class GapHandling {
     MOVE_FORWARD,
     NEXT_CORRECT,
-}
+}