Match RU dictionary header.

This brings the changes of I837831b1 to MR1.1
>>> 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: I81f281fda881ad1252cdf6cf2d0947a12a2dac27