fng-install: Fix missing output in error cases
Also reduce the minimal size for the FNGSystem partitions needs during yocto install.
Dear all, On Thursday, 4th September 2025, we will test the new disaster recovery environment. A disaster recovery test will take place between 4:00 PM and 6:00 PM CEST. Please refrain from making any changes, as they will be lost. Once testing is complete, the production environment will be restored. Thank you for your understanding.
Also reduce the minimal size for the FNGSystem partitions needs during yocto install.