remove parameters; clean inflation related code in polkadot runtime

[kianenigma]

output of the test:

Oct 30 12:37:54.179  INFO runtime::polkadot: total-staked = 848019558.366 DOT (8,480,195,583,663,520,091)    
Oct 30 12:37:54.179  INFO runtime::polkadot: total-issuance = 1512066550.617 DOT (15,120,665,506,175,654,580)    
Oct 30 12:37:54.179  INFO runtime::polkadot: staking-rate = 56.0834811152987811%    
Oct 30 12:37:54.179  INFO runtime::polkadot: era-duration = 86400000    
Oct 30 12:37:54.179  INFO runtime::polkadot: maxStakingRewards = None    
Oct 30 12:37:54.179  INFO runtime::polkadot: 💰 Inflation ==> staking = 279477.810 DOT (2,794,778,104,198,508) / leftover = 49319.613 DOT (493,196,136,035,030)    
Oct 30 12:37:54.179  INFO runtime::polkadot: inflation_rate runtime API: InflationInfo { inflation: 7.9368900607918775%, next_mint: (2794778104198508, 493196136035030) }    

[ggwpez]

/merge

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[kianenigma]

/merge