config/lib/exts: run shellfmt

- `bash lib/tools/shellfmt.sh`
- mostly spacing changes that accumulated over time

extensions/fs-nilfs2-support.sh

@@ -15,4 +15,3 @@ function pre_update_initramfs__add_module_into_initramfs_config() {
 	echo "nilfs2" >> "$MOUNT"/etc/initramfs-tools/modules
 	return 0
 }
-

lib/functions/compilation/kernel.sh

@@ -168,4 +168,3 @@ function kernel_package() {
 	prepare_kernel_packaging_debs "${kernel_work_dir}" "${kernel_dest_install_dir}" "${version}" kernel_install_dirs
 	display_alert "Kernel packaged in" "$((SECONDS - ts)) seconds - ${version}-${LINUXFAMILY}" "info"
 }
-