Bugfix in Doctor selectors

CoviDok/Data/MySQL/MySqlDoctorHandler.cs

@@ -37,11 +37,11 @@ namespace CoviDok.Data.MySQL
         {
             if (firstName != null && lastName != null)
             {
-                return (from d in context.Doctors where d.FirstName.ToLower().Contains(firstName) && d.LastName.ToLower().Contains(lastName.ToLower()) select d).ToList();
+                return (from d in context.Doctors where d.FirstName.ToLower().Contains(firstName.ToLower()) && d.LastName.ToLower().Contains(lastName.ToLower()) select d).ToList();
             }
             if (firstName != null)
             {
-                return (from d in context.Doctors where d.FirstName.ToLower().Contains(firstName) select d).ToList();
+                return (from d in context.Doctors where d.FirstName.ToLower().Contains(firstName.ToLower()) select d).ToList();
             }
             if (lastName != null)
             {