Fix issue 16472: Spurious "is used as a type" when aliasing enum temp…

[thewilsonator]

…late as default parameter

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	16472	normal	Spurious "is used as a type" when aliasing enum template as default parameter

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#12316"