fix: backend dynamic bill array usage

lib/cash-out/cash-out-actions.js

@@ -37,22 +37,14 @@ function mapDispense (tx) {
 
   if (_.isEmpty(bills)) return {}
 
-  return {
-    provisioned_1: bills[0].provisioned,
-    provisioned_2: bills[1].provisioned,
-    provisioned_3: bills[2].provisioned,
-    provisioned_4: bills[3].provisioned,
-    dispensed_1: bills[0].dispensed,
-    dispensed_2: bills[1].dispensed,
-    dispensed_3: bills[2].dispensed,
-    dispensed_4: bills[3].dispensed,
-    rejected_1: bills[0].rejected,
-    rejected_2: bills[1].rejected,
-    rejected_3: bills[2].rejected,
-    rejected_4: bills[3].rejected,
-    denomination_1: bills[0].denomination,
-    denomination_2: bills[1].denomination,
-    denomination_3: bills[2].denomination,
-    denomination_4: bills[3].denomination
-  }
+  const res = {}
+
+  _.forEach(it => {
+    res[`provisioned_${it + 1}`] = bills[it].provisioned
+    res[`denomination_${it + 1}`] = bills[it].denomination
+    res[`dispensed_${it + 1}`] = bills[it].dispensed
+    res[`rejected_${it + 1}`] = bills[it].rejected
+  }, _.times(_.identity(), _.size(bills)))
+
+  return res
 }