Remove commented method and unused import.

src/main/java/emu/grasscutter/database/DatabaseHelper.java

@@ -4,7 +4,6 @@ import java.util.List;
 
 import com.mongodb.client.result.DeleteResult;
 
-import dev.morphia.experimental.MorphiaSession;
 import dev.morphia.query.FindOptions;
 import dev.morphia.query.Sort;
 import dev.morphia.query.experimental.filters.Filters;
@@ -97,14 +96,11 @@ public final class DatabaseHelper {
 		return DatabaseManager.getDatastore().find(Account.class).filter(Filters.eq("playerId", playerId)).first();
 	}
 
-	//public static boolean deleteAccount(String username) {
-	//	return DatabaseManager.getDatastore().find(Account.class).filter(Filters.eq("username", username)).delete().getDeletedCount() > 0;
-	//}
 	public static void deleteAccount(Account target) {
 		// To delete an account, we need to also delete all the other documents in the database that reference the account.
 		// This should optimally be wrapped inside a transaction, to make sure an error thrown mid-way does not leave the
 		// database in an inconsistent state, but unfortunately Mongo only supports that when we have a replica set ...
-		
+
 		// Delete mails, gacha records, items and avatars.
 		DatabaseManager.getDatastore().find(Mail.class).filter(Filters.eq("ownerUid", target.getPlayerUid())).delete();
 		DatabaseManager.getDatastore().find(GachaRecord.class).filter(Filters.eq("ownerId", target.getPlayerUid())).delete();