display: don't let a SIGCONT write anything to the screen
The old praxis of calling total_refresh() upon a SIGCONT was confusing, because the screen would look as if nano had returned from suspension, but in fact the shell was still active. Instead of calling total_refresh(), put a no-op key into ncurses' buffer, so that, when nano actually does return out of suspension (through 'fg'), this key will be read and discarded, upon which nano will go sit and wait for the next key, just before which it calls doupdate(). The latter is all we need to get the entire screen restored. This also fixes https://savannah.gnu.org/bugs/?51131 for "tiny".
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