fix：修改全民冲榜保底等级

cehua_wcy

2018-08-17 9f4cc31bd06650124db9dfa8332e9d3612a84dff

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#lostTick Íæ¼Ò±¾´Î´ðÌâËùÓõÄʱ¼ä ºÁÃë 
( 
   int(max(8,min(24,8+4*(5000 - lostTick)/1000))) 
   
)