fix(activities-table.component.ts): remove subtraction of activity value in base currency for 'SELL' and 'LIABILITY' types

The subtraction of activity value in base currency for 'SELL' and 'LIABILITY' types was causing incorrect calculations. By returning null instead of subtracting the value, we ensure that the total value is not affected by these types of activities.

libs/ui/src/lib/activities-table/activities-table.component.ts

@@ -390,7 +390,7 @@ export class ActivitiesTableComponent implements OnChanges, OnDestroy, OnInit {
         if (activity.type === 'BUY' || activity.type === 'ITEM') {
           totalValue = totalValue.plus(activity.valueInBaseCurrency);
         } else if (activity.type === 'SELL' || activity.type === 'LIABILITY') {
-          totalValue = totalValue.minus(activity.valueInBaseCurrency);
+          return null;
         }
       } else {
         return null;