fix(database): remove extra comma in database seeding service

- Corrected a syntax error in the DatabaseSeedingService class
- Removed the extraneous comma in the content creation process
- This change ensures proper functionality when running the app and prevents potential errors during database seeding

Author: fulleni

lib/src/services/database_seeding_service.dart

@@ -266,7 +266,7 @@ class DatabaseSeedingService {
           createdAt: DateTime.now(),
           updatedAt: DateTime.now(),
           status: ContentStatus.active,
-        ),,
+        ),
       feedPreferences: const FeedDisplayPreferences(
         headlineDensity: HeadlineDensity.standard,
         headlineImageStyle: HeadlineImageStyle.smallThumbnail,