Bug: calculation of votedSplit could result in 0 value if yieldAccrued/2 * voting power < totalVotes

[RonTuretzky]

Context: https://github.com/BreadchainCoop/breadchain/pull/27#discussion_r1581819393

[RonTuretzky]

• [x] Add percision variable
• [x] amend voteSplit calculatio like so -uint256 votedSplit = ((halfBalance) (projectDistributions[i] PERCISION / totalVotes)) / PERCISION;