Patch to make VIM syntax highlight right.

Closed Carlo Landmeter requested to merge github/fork/Magicloud/vim into master

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.

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