setup: get_file_version() simplify logic
setup: get_file_version() simplify logic

trilean/gummiboot,miguelinux/gummiboot2systemd-boot,karelzak/gummiboot,FrozenCow/gummiboot,freedesktop-unofficial-mirror/gummiboot,liliang365/my_gummiboot,karelzak/gummiboot,aaronp24/gummiboot,freedesktop-unofficial-mirror/gummiboot,trilean/gummiboot,todorez/gummiboot-multiboot2,todorez/gummiboot-multiboot2,liliang365/my_gummiboot,todorez/tummiboot,FrozenCow/gummiboot,todorez/tummiboot,miguelinux/gummiboot2systemd-boot,aaronp24/gummiboot