IO-2829 Multiple Towing Lines

Signed-off-by: Allan Carr <allan.carr@thinkimex.com>

server/job/job-totals.js

@@ -489,7 +489,7 @@ function CalculateAdditional(job) {
     additionalCosts: null,
     additionalCostItems: [],
     adjustments: null,
-    towing: null,
+    towing: Dinero(),
     shipping: Dinero(),
     storage: null,
     pvrt: null,
@@ -512,7 +512,7 @@ function CalculateAdditional(job) {
       }
 
       if (val.line_desc.toLowerCase().includes("towing")) {
-        ret.towing = lineValue;
+        ret.towing = ret.towing.add(lineValue);
         return acc;
       } else {
         ret.additionalCostItems.push({ key: val.line_desc, total: lineValue });