bugfix (helpers): fix circular reexport

[e11sy]

Problem

Circular dependencie in the helpers package empty directory
This causes this build errors

Export "isEmpty" of module "node_modules/@editorjs/helpers/dist/empty/isEmpty.js" was reexported through module "node_modules/@editorjs/helpers/dist/empty/index.js" while both modules are dependencies of each other and will end up in different chunks by current Rollup settings. This scenario is not well supported at the moment as it will produce a circular dependency between chunks and will likely lead to broken execution order.
Either change the import in "node_modules/@editorjs/helpers/dist/index.js" to point directly to the exporting module or reconfigure "output.manualChunks" to ensure these modules end up in the same chunk.

Solution

mentioned imported file directly to solve circular dependencie