Ensure key descriptions in status bar are always null-terminated.
Ensure key descriptions in status bar are always null-terminated.

Key descriptions are just strncpy()'ed to key[], with KEYS_KEYLEN as
maximum character count. This leads to a non-null-terminated string if
the source pointer actually points to a string with a length of
KEYS_KEYLEN bytes. Always appending a null character fixes this.

Signed-off-by: Lukas Fleischer <af90e31281d8305af43dc616c5aaca3c7165f8a7@cryptocrack.de>

lfos/calcurse,dunecn/calcurse,lfos/calcurse,lfos/calcurse,dunecn/calcurse