fix(tui): piping nodejs to nvim breaks input handling #18932

Problem:
Piping NodeJS output into Neovim makes the editor unusable.
This happens because NodeJS changes the tty state on exit after
Nvim calls uv_tty_set_mode(). (May not always happen due to race
condition.)
This should have been fixed by 4ba5b4a86461 #13084. But some
commands and functions (:sleep, system(), …) call ui_flush()
internally, in particular the first tui_mode_change() is called before
the end of startup.

Steps to reproduce:
1. node -e "setTimeout(()=>{console.log('test')}, 1000)" | nvim -u NORC +"sleep 500m" -
2. The cursor key letters just overwrite the editor screen, and CTRL+C exits.

Solution:
Skip pending_mode_update during startup.
Note: Delaying ui_flush() entirely could be a more general solution
(emit a new UI event on VimEnter?). But "remote/coprocess TUI" #18375
could make all of this moot anyway.
Fixes #18470

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