Remove unnecessary template-registry.js export in rollup.config.mjs

[mkszepp]

This is fixing a warning while rollup & also a unnecessary file on npm

../ember-truth-helpers prepare: [js] (!) Generated an empty chunk
../ember-truth-helpers prepare: [js] "template-registry"

[SergeAstapov]

@mkszepp this is not correct change as you would not be able to do import type EmberTruthRegistry from 'ember-truth-helpers/template-registry'; in the consumer app or addon

[mkszepp]

@SergeAstapov i don't agree... the file in dist/template-registry is empty like you see in screenshot...

The import is only for typing and typing is using only file of declaration/template-registry

The rule in package.json makes possibile to use it, you don't need it to add it in rollup file