Billing - Small typescript fixes for Safari browser. (#670)

* Small typescript fixes for Safari browser.

web/src/pages/billing/BillingInvoiceMonthCost.tsx

@@ -169,7 +169,7 @@ const BillingCurrentCost = () => {
         const year = invoiceMonth.substring(0, 4)
         const month = invoiceMonth.substring(4, 6)
         let nextYear = year
-        let nextMonth = (parseInt(month, 10) + 1).toString()
+        let nextMonth = (parseInt(month, 10) + 1).toString().padStart(2, '0')
         if (month === '12') {
             nextYear = (parseInt(year, 10) + 1).toString()
             nextMonth = '01'

web/src/shared/components/Graphs/DonutChart.tsx

@@ -79,14 +79,15 @@ export const DonutChart: React.FC<IDonutChartProps> = ({ data, maxSlices, colors
     const margin = 15
     const radius = Math.min(width, height) / 2 - margin
 
-    // keep order of the slices
+    // keep order of the slices, declare custom sort function to keep order of slices as passed in
+    // by default pie function starts from index 1 and sorts by value
     const pieFnc = pie()
         .value((d) => d.value)
         .sort((a) => {
             if (typeof a === 'object' && a.type === 'inc') {
                 return 1
             }
-            return -1
+            return 0 // works both on Safari and Firefox, any other value will break one of them
         })
     const data_ready = pieFnc(data)
     const innerRadius = radius / 1.75 // inner radius of pie, in pixels (non-zero for donut)