Fix same-type where constraint generating non-generic type parameter in Swift 6

[Copilot]

• Fix: Generated mock for a specialized protocol is incorrect in Swift 6 language mode #347

When a protocol uses a same-type where constraint to specialize an inherited associated type (e.g. where Value == Int), mockolo incorrectly emits the associated type as a generic parameter on the mock class — a warning in Swift 5 and an error in Swift 6 language mode.

Before:

public protocol NarrowFoo: Foo where Value == Int {}

// Generated (broken in Swift 6):
public final class NarrowFooMock<Value>: NarrowFoo where Value == Int { ... }
// error: same-type requirement makes generic parameter 'Value' non-generic

After:

// Generated (correct):
public class NarrowFooMock: NarrowFoo { ... }

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✅ sidepelican
❌ Copilot
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[fummicc1]

LGTM!