add iso codes to phone data

app/javascript/submission_form/phone_step.vue

@@ -180,8 +180,8 @@ export default {
   },
   computed: {
     countries () {
-      return phoneData.map(([name, dial, flag, tz]) => {
+      return phoneData.map(([iso, name, dial, flag, tz]) => {
-        return { name, dial, flag, tz }
+        return { iso, name, dial, flag, tz }
       })
     },
     countriesDialIndex () {

app/javascript/submission_form/verification_step.vue

@@ -95,7 +95,7 @@ export default {
     countryCode () {
       const browserTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone
       const browserTz = browserTimeZone.split('/')[1]
-      const country = phoneData.find(([a, b, c, tz]) => tz.includes(browserTz))
+      const country = phoneData.find(([a, b, c, e, tz]) => tz.includes(browserTz))
 
       return country[0]
     },