Layers should have vuetify key

[userquin]

When using layers, should have vuetify to avoid load/scan other modules.

Should revert last PR changes (partially)

Check if the vuetify nuxt module included in layers.

[AndreyYolkin]

Closing as obsolete — this was an old internal note and the layers handling has been substantially reworked since (see test/layers.test.ts). If a concrete issue remains, let's track it in a fresh, specific issue.