Lift restrictions for Scope disposal when using ambient ScopeContext

[dadhi]

The restriction is checking if container scope is the same as the current ambient scope from the context, and only then disposing it - otherwise not.

Now I am disposing current ambient scope without any checks - anyway ambient scopes could be changed any time not depending on container.

This may provide more predictability for AsyncExecutionFlowScopeContext and ThreadScopeContext.

[dadhi]

fixed