Revert "In Amend/Edify conversion menu, submit a default choice if user presses Enter, depending on whether updater-script or update-script (or nothing) present"

This reverts commit 67deca531f1639c96d928cd0d58d8b42b955959e.
Revert "Change method of flashing boot.img in SGH-I747 (package_extract_file with no tmp folder)"

This reverts commit e6439b5c6ca4ed0c98211d7ae5f5d072f2a0b127.