fix: convert pab table values in number when they are type of string

Refs #652

src/app/components/pab-table/pab-table.component.ts

@@ -1385,6 +1385,9 @@ export class PabTableComponent implements AfterViewInit, AfterViewChecked, OnIni
     }
 
     public getCellValue(cell) {
+        if(typeof cell.model.singleValue === "string") {
+            cell.model.singleValue = +cell.model.singleValue;
+        }
         return round(cell.model.singleValue, this.nDigits);
     }