remove toLower (#361)

Author: markti

src/Relecloud.Web.Api/Services/SqlDatabaseConcertRepository/SqlDatabaseConcertRepository.cs

@@ -153,13 +153,13 @@ public async Task<CreateResult> CreateCustomerAsync(Customer newCustomer)
             }
 
             var customer = await this.database.Customers
-                .FirstOrDefaultAsync(c => c.Email.ToLower() == newCustomer.Email.ToLower());
+                .FirstOrDefaultAsync(c => c.Email == newCustomer.Email);
             if (customer == null)
             {
                 customer = new Customer
                 {
                     Id = newCustomer.Id,
-                    Email = newCustomer.Email,
+                    Email = newCustomer.Email.ToLower(),
                     Name = newCustomer.Name,
                     Phone = newCustomer.Phone,
                 };