Patch initramfs-init.in to make VIM syntax highlight right.
Created by: Magicloud
sh.vim comes with VIM 8 could not identify the matching of following case.
> "${KOPT_apkovl/{MAC\}/$MAC_ADDRESS}"
Hence the "color" afterwards is totally messed. Luckily, following escaping works in busybox.
> "${KOPT_apkovl/\{MAC\}/$MAC_ADDRESS}"
Thus I made this fix.