input: discard a verbatim 0x0A or 0x00 byte, depending on the mode
This disallows entering a verbatim ^J (0x0A) when typing text or search terms, and disallows a verbatim ^@ (0x00) when typing a filename. Nano beeps when the disallowed code is attempted. This addresses https://savannah.gnu.org/bugs/?49897.
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