tui: Recognize "Tc" terminfo capability.

This is a new convention pioneered by tmux.  It does not do much for
nvim; since nvim always looks to see whether it should be making up
"setrgbf" and "setrgbb" capabilities.  But it is a way for terminfo to
force this, irrespective of the hardwired list in the code, for more
terminal types.  On the gripping hand, updating terminfo descriptions to
actually have "setrgbf" and "setrgbb" capabilities so that nvim never
has to try to invent them in the first place, is as good if not better
an approach for overriding what is baked into the code.

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