Update import for private type location for build results

NOTE: this *will not* type-check until you have done a build, because
it is the result of emitting types to the production build location.
However, this matches the actual import location to which this type
would be emitted. Since this is an internal-only type whose presence
consumers should not rely on and which they should not use in any way,
this is "safe" from a public API POV.

test/types/component-test.ts

@@ -5,7 +5,13 @@ import * as gc from '@glimmer/component';
 // expect to be -- and this keeps us honest about the fact that if we *change*
 // this import location, we've broken any existing declarations published using
 // the current type signatures.
-import { EmptyObject } from '@glimmer/component/addon/-private/component';
+//
+// NOTE: this *will not* type-check until you have done a build, because it is
+// the result of emitting types to the production build location. However, this
+// matches the actual import location to which this type would be emitted. Since
+// this is an internal-only type whose presence consumers should not rely on and
+// which they should not use in any way, this is "safe" from a public API POV.
+import { EmptyObject } from '@glimmer/component/dist/types/addon/-private/component';
 
 const Component = gc.default;