Value Object Configuration Issue

When using the extension method to find configuration files, this error occurs:

```
[16:22:36 INF] Seeding Database...catalogContext
[16:22:36 ERR] The entity type 'ImageBanner' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types, see https://go.microsoft.com/fwlink/?linkid=2141943.
```

Relevant code from AppDbContext:

```csharp
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);

modelBuilder.ApplyAllConfigurationsFromCurrentAssembly(); // causes problems

// alternately this is built-in to EF Core 2.2
//modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
}

```

Using the built-in `ApplyConfigurationsFromAssembly` version works fine.

Reproduce the error from AppDbContext.OnModelCreating using ApplyAllConfigurationsFromCurrentAssembly, then inspect that extension and compare its behavior with EF Core's ApplyConfigurationsFromAssembly. Done means the extension no longer produces the ImageBanner primary-key error while the built-in method continues to work.

Written by the indexing model from the issue text.