Disable 24bit-color on neovim's terminal

Unfortunately, nvim will, even when running in a terminal that supports
it, swallow the sequences whole, rendering the displayed text _white_.

This means falling back to 256 colors is the lesser evil as at least a
blue-ish color will display as blue while a red-ish will be red, instead
of both showing white.

nvim's behavior does _not_ change depending on
$NVIM_TUI_ENABLE_TRUE_COLOR or any other option I could find and neovim-qt
exhibits the same behavior.

Fixes #2600.

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