fix(test): revert cash spec expected values to correct leap year calculations

apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-cash.spec.ts

@@ -241,7 +241,7 @@ describe('PortfolioCalculator', () => {
         grossPerformance: new Big(0),
         grossPerformancePercentage: new Big(0),
         grossPerformancePercentageWithCurrencyEffect: new Big(
-          '0.08211538461538461533'
+          '0.08211603004634809014'
         ),
         grossPerformanceWithCurrencyEffect: new Big(70),
         includeInTotalAssetValue: false,
@@ -271,9 +271,9 @@ describe('PortfolioCalculator', () => {
         },
         quantity: new Big(2000),
         symbol: 'USD',
-        timeWeightedInvestment: new Big('912.48633879781420820235'),
+        timeWeightedInvestment: new Big('912.47956403269754768392'),
         timeWeightedInvestmentWithCurrencyEffect: new Big(
-          '852.4590163934426234665'
+          '852.45231607629427792916'
         ),
         valueInBaseCurrency: new Big(1820)
       });