neovim: shift+tab sends tab

[mklein994]

Name	Version
Android	7.1 (CyanogenMod 14.1 nightly)
Architecture	arm
Termux	0.42
Neovim	0.2.0.201611271920

<S-Tab> is useful for going to the previous match after using Neovim's 'wildchar' feature.

Using <S-Tab> (with the tab key in the extra keys bar) in Neovim doesn't work; it only produces a tab character: ^I. The same problem happens when I enter <C-S-i> (i.e. Shift, then VolDown+i), which I thought would send the same key combination.

As a workaround, both <Left> and <C-p> work (see :help c_CTRL-P).

Note: Normally, terminals don't distinguish between <C- and <C-S- sequences, but Neovim has a workaround for specific ones (see https://neovim.io/doc/user/vim_diff.html#nvim-features).

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