Fix invalid int to boolean cast (#48)

This pull request includes an important change to the
`BadgeRepositoryImpl` class in the
`lib/data/repositories/badge_repository_impl.dart` file. The change
ensures that the `isRepeatable` field is correctly interpreted as a
boolean value.

*
[`lib/data/repositories/badge_repository_impl.dart`](diffhunk://#diff-a5d31f0bcee322da666ab358d4acdb8b9cf466eb87a5b6fc56ef232051514db8L67-R67):
Modified the `isRepeatable` field to be interpreted as a boolean value
instead of an integer.

Author: Jozys

lib/data/repositories/badge_repository_impl.dart

@@ -64,7 +64,7 @@ class BadgeRepositoryImpl implements BadgeRepository {
           category: AchievementBadgeCategory.values[data['category']],
           threshold: data['threshold'],
           iconPath: data['iconPath'],
-          isRepeatable: data['isRepeatable'] ?? 0,
+          isRepeatable: data['isRepeatable'] == 0 ? false : true,
           epValue: data['epValue'] ?? 0,
         );
       }).toList();