single-src: inline calculatedProudction into production getter

Author: kaiosilveira

src/single-source/index.js

@@ -5,10 +5,6 @@ export class ProductionPlan {
   }
 
   get production() {
-    return this.calculatedProduction;
-  }
-
-  get calculatedProduction() {
     return this._adjustments.reduce((sum, a) => sum + a.amount, 0);
   }