Update iso690-author-date-cs.csl

conference paper if both conference title and event (proceeding title) than write in bibilography Konference name: event
Template:
STRAKA, Ondřej, ŠIMANDL, Miroslav a DUNÍK, Jindřich. Gaussian
mixtures proposal density in particle filter for track-before-detect. In:
Fusion 2009: the 12th international conference on information fusion. New
York: IEEE, 2009, s. 270-277. ISBN 978-0-9824438-0-4.