fixed jpa method

dao/src/main/java/org/thingsboard/server/dao/sql/oauth2/JpaOAuth2ClientDao.java

@@ -81,7 +81,7 @@ public class JpaOAuth2ClientDao extends JpaAbstractDao<OAuth2ClientEntity, OAuth
 
     @Override
     public String findAppSecret(UUID id, String pkgName, PlatformType platformType) {
-        return repository.findAppSecret(id, pkgName, platformType.name());
+        return repository.findAppSecret(id, pkgName, platformType);
     }
 
     @Override

dao/src/main/java/org/thingsboard/server/dao/sql/oauth2/OAuth2ClientRepository.java

@@ -22,6 +22,7 @@ import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import org.springframework.transaction.annotation.Transactional;
+import org.thingsboard.server.common.data.oauth2.PlatformType;
 import org.thingsboard.server.dao.model.sql.OAuth2ClientEntity;
 
 import java.util.List;
@@ -75,7 +76,7 @@ public interface OAuth2ClientRepository extends JpaRepository<OAuth2ClientEntity
             "AND a.pkgName = :pkgName and a.platformType = :platformType")
     String findAppSecret(@Param("clientId") UUID id,
                          @Param("pkgName") String pkgName,
-                         @Param("platformType") String platformType);
+                         @Param("platformType") PlatformType platformType);
 
     @Transactional
     @Modifying