ci(github): fix build script in packages/cacti-ledger-browser

[ruzell22]

Description

The current react build scripts are not at all producing the structure of the ./dist folder that we need when running yarn run configure and yarn run custom-checks.

Refer to this comment for test and discussion: https://github.com/hyperledger-cacti/cacti/pull/3706#issuecomment-2551640109

Acceptance Criteria

1. Build script of the package is producing the expected structure of ./dist folder
2. yarn run custom-checks is running successfully and is passing on this specific package with no error