Fix CordbAssembly ID

Author: elinor-fung

src/coreclr/debug/di/rsassembly.cpp

@@ -29,7 +29,7 @@ CordbAssembly::CordbAssembly(CordbAppDomain *       pAppDomain,
                              VMPTR_DomainAssembly   vmDomainAssembly)
 
     : CordbBase(pAppDomain->GetProcess(),
-                vmDomainAssembly.IsNull() ? VmPtrToCookie(vmAssembly) : VmPtrToCookie(vmDomainAssembly),
+                VmPtrToCookie(vmAssembly),
                 enumCordbAssembly),
       m_vmAssembly(vmAssembly),
       m_vmDomainAssembly(vmDomainAssembly),