fix: dont commuicate wrong flash premium

[sakulstra]

• fix: don't require flashloan premium when premium is zero
  • currently there are two cases in which flashloan premium is zero (being flashborrower & using mode != 0) - in the case of mode != 0, currently the receiver would receive flashLoanPremium != 0 which will not be required to return. With the applied fix the premium will be correctly passed as 0

[height]

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (94e571f) 99.65% compared to head (0105bd3) 99.65%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #822   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files          45       45           
  Lines        2300     2303    +3     
  Branches      421      423    +2     
=======================================
+ Hits         2292     2295    +3     
  Misses          8        8           

Impacted Files	Coverage Δ
...tracts/protocol/libraries/logic/FlashLoanLogic.sol	100.00% <100.00%> (ø)

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