Update rollup.config.mjs to workaround not working re-export

[SergeAstapov]

Closes #67

I still haven't found root cause why this happens, but I'm confident it's an issue around ember-auto-import as it's responsible for bundling.

Will create reproduction repo and then create ticket in ember-auto-import.
But meanwhile, this can merged as temp solution to fix an existing issue.

[SergeAstapov]

@villander this is dirty and hacky, but would make things work for consumers of this addon (who don't care about this minor tweak as long as things work for them)

[SergeAstapov]

need bit more time to confirm this actually fixes the issue

[villander]

@SergeAstapov could you please provide a public reproduction when you get the chance?

[SergeAstapov]

created embroider-build/ember-auto-import#619 as an issue and created minimal reproduction in https://github.com/SergeAstapov/v2-addons-as-deps-of-lazy-engines-repro/commits/main/

@villander do you think you could land this and release (as well as #93 and #94) as is while above discussed and addressed? This would close existing issue #67 and make lib usable with no issues.