Fix boost math and decimal

[nkrulikovsky]

What does this PR do?

• Boost math Boost logic is based on the following logic.

  
  (min((userLiquidity*40/100) + TotalLiquidity*UserVeSdlBalance/TotalVeSdlBalance*(100-40)/100 , UserLiquidity)) / (UserLiquidity*40/100)

- UserVeSdlBalance = 0
Then boost = (min(UserLiquidity*40/100, UserLiquidity) / (UserLiquidity*40/100) = 1.0

- UserVeSdlBalance = TotalVeSdlBalance
Then `TotalLiquidity*UserVeSdlBalance/TotalVeSdlBalance*(100-40)/100` will be `TotalLiquidity*(100-40)/100` .
numerator will be UserLiquidity.

So, boost = UserLiquidity/(UserLiquidity * 40 /100) = 2.5,  this is max value of the bost.

- veSDL for max boost
When `userLiquidity*40/100) + TotalLiquidity*UserVeSdlBalance/TotalVeSdlBalance*(100-40)/100` === `UserLiquidity`, user can have max boost under user's Liquidity.
In this case, `TotalLiquidity*UserVeSdlBalance/TotalVeSdlBalance` should be  `UserLiqudiity` for maxboost
So, `UserVeSdlBalance = (UserLiquidity / TotalLiquidity ) * TotalVeSdlBalance`. This is veSDL balance for max boost.

## Context

closes: https://github.com/saddle-finance/saddle-frontend/issues/1138

[codecov[bot]]

Codecov Report

Merging #1140 (7f5e260) into master (01dc63d) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1140      +/-   ##
==========================================
- Coverage   10.16%   10.13%   -0.03%     
==========================================
  Files         154      154              
  Lines        5570     5586      +16     
  Branches     1780     1785       +5     
==========================================
  Hits          566      566              
- Misses       5002     5018      +16     
  Partials        2        2              

Impacted Files	Coverage Δ
src/hooks/useUserGauge.ts	0.00% <0.00%> (ø)
src/pages/Farm/StakeDialog.tsx	0.00% <0.00%> (ø)
src/pages/VeSDL/VeTokenCalculator.tsx	0.00% <0.00%> (ø)
src/utils/index.ts	46.63% <0.00%> (+0.22%)	:arrow_up:

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