get Real Customers: fix findByActive + database change

src/main/kotlin/com/aitrainer/api/repository/CustomerRepository.kt

@@ -5,6 +5,6 @@ import org.springframework.data.jpa.repository.JpaRepository
 import org.springframework.stereotype.Repository
 
 @Repository
-interface CustomerRepository : JpaRepository<Customer, Long>{
-    fun findRealCustomers(active: String):List<Customer>
-}
+interface CustomerRepository : JpaRepository<Customer, Long> {
+    fun findByActive( active: String? ):List<Customer>
+}