Update RU dictionary header.

>>> dictionaries/ru_wordlist.combined.gz
>>> java/res/raw/main_ru.dict
Header :
  date : 1353500945 <=> 1353567943
  MULTIPLE_WORDS_DEMOTION_RATE : null <=> 0
Body :
  No differences

Bug: 7540132
Change-Id: I837831b1e214da64962cf1bb68c840a3d4e6bf76