mod_pastebin: Off-by-one, the hardest problem known to man The threshold set to 4 allowed 4 lines and pastebinned 5. 040eaa3844f4 unintentionally changed this so that 4 lines were pastebinned. This commit restores the previous behavior.

This module writes out a traceback to `traceback.txt` in Prosodys data
directory (see `prosodyctl about`) when the signal `SIGUSR1` is
received. This is useful when debugging seemingly frozen instances in
case it is stuck in Lua code.