fixed liveactivity issue

- Fixed a bug where if it's less than one hour before the first class, the LiveActivity is created, but if the user rolls back the time to more than one hour before the first class, the LiveActivity does not end."

refilc/lib/api/providers/live_card_provider.dart

@@ -362,7 +362,12 @@ class LiveCardProvider extends ChangeNotifier {
     }
 
     //END
-    if (hasActivityStarted &&
+    if (hasActivityStarted && nextLesson != null &&
+        nextLesson!.start.difference(now).inMinutes > 60) {
+      debugPrint("Több, mint 1 óra van az első óráig. Befejezés...");
+      PlatformChannel.endLiveActivity();
+      hasActivityStarted = false;
+    } else if (hasActivityStarted &&
         !hasDayEnd &&
         nextLesson == null &&
         now.isAfter(prevLesson!.end)) {